bt.test.r

###############################################################################
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
###############################################################################
# Evaluting Sample Trading Strategies using Backtesting library in 
# the Systematic Investor Toolbox
# Copyright (C) 2011  Michael Kapler
#
# For more information please visit my blog at www.SystematicInvestor.wordpress.com
# or drop me a line at TheSystematicInvestor at gmail
###############################################################################

bt.empty.test <- function() 
{	
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = spl('SPY')

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1970-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)	
	bt.prep(data, align='keep.all', dates='1970::2011')

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	prices = data$prices    

	# Buy & Hold	
	data$weight[] = 0
	buy.hold = bt.run(data, trade.summary=T)

	#*****************************************************************
	# Create Report
	#****************************************************************** 	

	plotbt.custom.report.part1( buy.hold, trade.summary =T)
	plotbt.custom.report.part2( buy.hold, trade.summary =T)
	plotbt.custom.report.part3( buy.hold, trade.summary =T)

}

###############################################################################
# How to use execution.price functionality
###############################################################################
bt.execution.price.test <- function() 
{	 
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = spl('SPY')

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1970-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)			
	bt.prep(data, align='keep.all', dates='1970::')	

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	prices = data$prices   
	nperiods = nrow(prices)

	models = list()

	#*****************************************************************
	# Buy & Hold
	#****************************************************************** 
	data$weight[] = 0
		data$execution.price[] = NA
		data$weight[] = 1
	models$buy.hold = bt.run.share(data, clean.signal=T)

	#*****************************************************************
	# MA cross-over strategy
	#****************************************************************** 
	sma.fast = SMA(prices, 50)
	sma.slow = SMA(prices, 200)
		signal = iif(sma.fast >= sma.slow, 1, -1)

	data$weight[] = NA
		data$execution.price[] = NA
		data$weight[] = signal
	models$ma.crossover = bt.run.share(data, clean.signal=T, trade.summary = TRUE)

	#*****************************************************************
	# MA cross-over strategy, add 10c per share commission
	#*****************************************************************	
	data$weight[] = NA
		data$execution.price[] = NA
		data$weight[] = signal
	models$ma.crossover.com = bt.run.share(data, commission = 0.1, clean.signal=T)

	#*****************************************************************
	# MA cross-over strategy:
	# Exit trades at the close on the day of the signal
	# Enter trades at the open the next day after the signal	
	#****************************************************************** 
	popen = bt.apply(data, Op)		
	signal.new = signal
		trade.start	 = which(signal != mlag(signal) & signal != 0)
		signal.new[trade.start] = 0
		trade.start = trade.start + 1

	data$weight[] = NA
		data$execution.price[] = NA
		data$execution.price[trade.start,] = popen[trade.start,]
		data$weight[] = signal.new
	models$ma.crossover.enter.next.open = bt.run.share(data, clean.signal=T, trade.summary = TRUE)


	#*****************************************************************
	# Create Report
	#****************************************************************** 	
	# put all reports into one pdf file
	#pdf(file = 'report.pdf', width=8.5, height=11)
		models = rev(models)


png(filename = 'plot1.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')		

		# Plot perfromance
		plotbt(models, plotX = T, log = 'y', LeftMargin = 3)	    	
			mtext('Cumulative Performance', side = 2, line = 1)

dev.off()				

png(filename = 'plot2.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')		

		# Plot trades
		plotbt.custom.report.part3(models$ma.crossover, trade.summary = TRUE)		

dev.off()					
png(filename = 'plot3.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')		

		plotbt.custom.report.part3(models$ma.crossover.enter.next.open, trade.summary = TRUE)		

dev.off()			
	#dev.off()	












	#*****************************************************************
	# Simple example showing the difference in a way commission is integrated into returns
	#****************************************************************** 	
	commission = 4
	data$weight[] = NA
		data$execution.price[] = NA
		data$weight[201,] = 1
		data$weight[316,] = 0				
		data$execution.price[201,] = prices[201,] + commission
		data$execution.price[316,] = prices[316,] - commission		
	models$test.com = bt.run.share(data, clean.signal=T, trade.summary=T)

	data$weight[] = NA
		data$execution.price[] = NA
		data$weight[201,] = 1
		data$weight[316,] = 0					
	models$test.com.new = bt.run.share(data, commission=commission, trade.summary=T, clean.signal=T)

	cbind(last(models$test.com$equity), last(models$test.com.new$equity),
		as.double(prices[316] - commission)/as.double(prices[201] + commission))

	as.double(prices[202]) / as.double(prices[201] + commission)-1
	models$test.com$equity[202]-1

	as.double(prices[202] - commission) / as.double(prices[201])-1
	models$test.com.new$equity[202]-1


	#plotbt.custom.report.part1(models)

	#*****************************************************************
	# Example showing the difference in a way commission is integrated into returns
	#****************************************************************** 		
	commission = 0.1
	sma.fast = SMA(prices, 50)
	sma.slow = SMA(prices, 200)

	weight = iif(sma.fast >= sma.slow, 1, -1)	
		weight[] = bt.exrem(weight)
		index = which(!is.na(weight))
		trade.start = index+1		
		trade.end = c(index[-1],nperiods)
		trade.direction = sign(weight[index])


	data$weight[] = NA
		data$execution.price[] = NA
		data$weight[] = weight
	models$test.com.new = bt.run.share(data, commission=commission, trade.summary=T, clean.signal=T)


	data$weight[] = NA
		data$execution.price[] = NA

		index = which(trade.direction > 0)
		data$execution.price[trade.start[index],] = prices[trade.start[index],] + commission
		data$execution.price[trade.end[index],] = prices[trade.end[index],] - commission

		index = which(trade.direction < 0)
		data$execution.price[trade.start[index],] = prices[trade.start[index],] - commission
		data$execution.price[trade.end[index],] = prices[trade.end[index],] + commission

		data$weight[trade.start,] = trade.direction
		data$weight[trade.end,] = 0		

	models$test.com = bt.run.share(data, clean.signal=T, trade.summary=T)


	#plotbt.custom.report.part1(models)

}


###############################################################################
# How to use commission functionality
###############################################################################
bt.commission.test <- function() 
{	 
	# cents / share commission
   	#   trade cost = abs(share - mlag(share)) * commission$cps
	# fixed commission per trade to more effectively to penalize for turnover
   	#   trade cost = sign(abs(share - mlag(share))) * commission$fixed
	# percentage commission
	#   trade cost = price * abs(share - mlag(share)) * commission$percentage
	#
	# commission = list(cps = 0.0, fixed = 0.0, percentage = 0/100)
	# cps - cents per share i.e. cps = 1.5 is 1.5 cents per share commision
	# fixed - fixed cost i.e. fixed = $15 is $15 per trade irrelevant of number of shares
	# percentage - percentage cost i.e. percentage = 1/100 is 1% of trade value	


	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = spl('EEM')

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1970-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)			
	bt.prep(data, align='keep.all', dates='2013:08::2013:09')	

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 		
	buy.date = '2013:08:14'	
	sell.date = '2013:08:15'
	day.after.sell.date = '2013:08:16'		

	capital = 100000
	prices = data$prices
	share = as.double(capital / prices[buy.date])

	# helper function to compute trade return
	comp.ret <- function(sell.trade.cost, buy.trade.cost) { round(100 * (as.double(sell.trade.cost) / as.double(buy.trade.cost) - 1), 2) }

	#*****************************************************************
	# Zero commission
	#****************************************************************** 
	data$weight[] = NA
		data$weight[buy.date] = 1
		data$weight[sell.date] = 0
		commission = 0.0
	model = bt.run.share(data, commission = commission, capital = capital, silent = T)

	comp.ret( share * prices[sell.date], share * prices[buy.date] )		
	comp.ret( model$equity[day.after.sell.date], model$equity[buy.date] )		

	#*****************************************************************
	# 10c cps commission
	# cents / share commission
   	#   trade cost = abs(share - mlag(share)) * commission$cps	
	#****************************************************************** 
	data$weight[] = NA
		data$weight[buy.date] = 1
		data$weight[sell.date] = 0
		commission = 0.1
	model = bt.run.share(data, commission = commission, capital = capital, silent = T)

	comp.ret( share * (prices[sell.date] - commission), share * (prices[buy.date] + commission) )
	comp.ret( model$equity[day.after.sell.date], model$equity[buy.date] )		

	#*****************************************************************
	# $5 fixed commission
	# fixed commission per trade to more effectively to penalize for turnover
   	#   trade cost = sign(abs(share - mlag(share))) * commission$fixed	
	#****************************************************************** 
	data$weight[] = NA
		data$weight[buy.date] = 1
		data$weight[sell.date] = 0
		commission = list(cps = 0.0, fixed = 5.0, percentage = 0.0)	
	model = bt.run.share(data, commission = commission, capital = capital, silent = T)

	comp.ret( share * prices[sell.date] - commission$fixed, share * prices[buy.date] + commission$fixed )
	comp.ret( model$equity[day.after.sell.date], model$equity[buy.date] )		

	#*****************************************************************
	# % commission
	# percentage commission
	#   trade cost = price * abs(share - mlag(share)) * commission$percentage	
	#****************************************************************** 
	data$weight[] = NA
		data$weight[buy.date] = 1
		data$weight[sell.date] = 0
		commission = list(cps = 0.0, fixed = 0.0, percentage = 1/100)	
	model = bt.run.share(data, commission = commission, capital = capital, silent = T)

	comp.ret( share * prices[sell.date] * (1 - commission$percentage), share * prices[buy.date] * (1 + commission$percentage) )
	comp.ret( model$equity[day.after.sell.date], model$equity[buy.date] )		

	return

	#*****************************************************************
	# Not Used
	#*****************************************************************
#	comp.ret( as.double(share * prices[sell.date] - commission$fixed)*(share * prices[buy.date] -commission$fixed), share^2 * prices[buy.date]^2 )	
#	as.double(share * prices[sell.date] - commission$fixed) / (share * prices[buy.date]) *
#	as.double(share * prices[buy.date] -commission$fixed) /  (share * prices[buy.date]) - 1
#	
	# Say following is time-line 0, A, B, C, 1, 2
	# We open share position at 0 and close at 1
	# 
	# Proper Logic
	# ret = (share * price1 - commission) / (share * price0 + commission)	
	#
	# Current Logic	
	# trade start: cash = price0 * share
	# retA = (share * priceA - commission) / (share * price0)
	# retB = (share * priceB) / (share * priceA)
	# retC = (share * priceC) / (share * priceB)
	# ret1 = (share * price1 - commission) / (share * priceC)
	# ret2 = (cash - commission) / (cash)
	# ret = retA * retB * retC * ret1 * ret2 - 1

    #*****************************************************************
    # Code Strategies 
	#******************************************************************		
    obj = portfolio.allocation.helper(data$prices,          
    	periodicity = 'months', lookback.len = 60,              
    	min.risk.fns = list(EW=equal.weight.portfolio)
	)

    commission = list(cps = 0.0, fixed = 0.0, percentage = 0/100)        
    models = create.strategies(obj, data, capital = capital, commission = commission )$models
    
    ret = models$EW$ret

    commission = list(cps = 0.0, fixed = 0.0, percentage = 4/100)        
    models = create.strategies(obj, data, capital = capital, commission = commission )$models
        
    ret = cbind(ret, models$EW$ret)
    
    round(100 * cbind(ret, ret[,1] - ret[,2]),2)
    write.xts(cbind(ret, ret[,1] - ret[,2]), 'diff.csv')	

    
    
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	tickers = spl('SPY,QQQ,EEM,IWM,EFA,TLT,IYR,GLD')

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1980-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)							
	bt.prep(data, align='remove.na', dates='1990::') 

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 						
	obj = portfolio.allocation.helper(data$prices, 
		periodicity = 'months', lookback.len = 60, 
		min.risk.fns = list(
			EW=equal.weight.portfolio
		)
	)

	capital = 100000
	commission = list(cps = 0.0, fixed = 0.0, percentage = 0/100)
	models = create.strategies(obj, data, capital = capital, commission = commission )$models


    #*****************************************************************
    # Create Report
    #******************************************************************    
	strategy.performance.snapshoot(models, T)    
}	




###############################################################################
# Cross Pollination from Timely Portfolio
# http://timelyportfolio.blogspot.ca/2011/08/drawdown-visualization.html
# http://timelyportfolio.blogspot.ca/2011/08/lm-system-on-nikkei-with-new-chart.html
###############################################################################
bt.timelyportfolio.visualization.test <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = spl('SPY')

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1970-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)		
	bt.prep(data, align='keep.all', dates='2000::2011')

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	prices = data$prices    

	# Buy & Hold	
	data$weight[] = 1
	buy.hold = bt.run(data)	

	# Strategy
	ma10 = bt.apply.matrix(prices, EMA, 10)
	ma50 = bt.apply.matrix(prices, EMA, 50)
	ma200 = bt.apply.matrix(prices, EMA, 200)
	data$weight[] = NA;
		data$weight[] = iif(ma10 > ma50 & ma50 > ma200, 1, 
						iif(ma10 < ma50 & ma50 < ma200, -1, 0))
	strategy = bt.run.share(data, clean.signal=F)


	#*****************************************************************
	# Visualization of system Entry and Exit based on
	# http://timelyportfolio.blogspot.ca/2011/08/lm-system-on-nikkei-with-new-chart.html
	#****************************************************************** 	
png(filename = 'plot1.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										

	layout(1)
	plota(strategy$eq, type='l', ylim=range(buy.hold$eq,strategy$eq))

		col = iif(strategy$weight > 0, 'green', iif(strategy$weight < 0, 'red', 'gray'))
	plota.lines(buy.hold$eq, type='l', col=col)		

		plota.legend('strategy,Long,Short,Not Invested','black,green,red,gray')

dev.off()			
	#*****************************************************************	
	# Drawdown Visualization 
	# 10% drawdowns in yellow and 15% drawdowns in orange
	# http://timelyportfolio.blogspot.ca/2011/08/drawdown-visualization.html
	#*****************************************************************	
png(filename = 'plot2.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										

	layout(1:2)
	drawdowns = compute.drawdown(strategy$eq)
	highlight = drawdowns < -0.1

	plota.control$col.x.highlight = iif(drawdowns < -0.15, 'orange', iif(drawdowns < -0.1, 'yellow', 0))	

	plota(strategy$eq, type='l', plotX=F, x.highlight = highlight, ylim=range(buy.hold$eq,strategy$eq))
		plota.legend('strategy,10% Drawdown,15%  Drawdown','black,yellow,orange')

	plota(100*drawdowns, type='l', x.highlight = highlight)
		plota.legend('drawdown', 'black', x='bottomleft')

dev.off()		
	#*****************************************************************
	# Create Report
	#****************************************************************** 		
png(filename = 'plot3.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										

	plota.control$col.x.highlight = iif(drawdowns < -0.15, 'orange', iif(drawdowns < -0.1, 'yellow', 0))				
	highlight = drawdowns < -0.1

	plotbt.custom.report.part1(strategy, buy.hold, x.highlight = highlight)

dev.off()	


}


###############################################################################
# Improving Trend-Following Strategies With Counter-Trend Entries by david varadi
# http://cssanalytics.wordpress.com/2011/07/29/improving-trend-following-strategies-with-counter-trend-entries/
###############################################################################
bt.improving.trend.following.test <- function() 
{	
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = spl('SPY')

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1970-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)		
	bt.prep(data, align='keep.all', dates='1970::2011')

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	prices = data$prices    

	# Buy & Hold	
	data$weight[] = 1
	buy.hold = bt.run(data)	

	# Trend-Following strategy: Long[Close > SMA(10) ]
	sma = bt.apply(data, function(x) { SMA(Cl(x), 10) } )	
	data$weight[] = NA
		data$weight[] = iif(prices >= sma, 1, 0)
	trend.following = bt.run(data, trade.summary=T)			

	# Trend-Following With Counter-Trend strategy: Long[Close > SMA(10), DVB(1) CounterTrend ]
	dv = bt.apply(data, function(x) { DV(HLC(x), 1, TRUE) } )	
	data$weight[] = NA
		data$weight[] = iif(prices > sma & dv < 0.25, 1, data$weight)
		data$weight[] = iif(prices < sma & dv > 0.75, 0, data$weight)
	trend.following.dv1 = bt.run(data, trade.summary=T)			

	#*****************************************************************
	# Create Report
	#****************************************************************** 	

png(filename = 'plot1.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										
	plotbt.custom.report.part1(trend.following.dv1, trend.following, buy.hold)
dev.off()	


png(filename = 'plot2.png', width = 1200, height = 800, units = 'px', pointsize = 12, bg = 'white')	
	plotbt.custom.report.part2(trend.following.dv1, trend.following, buy.hold)
dev.off()	


	#*****************************************************************
	# Sensitivity Analysis
	#****************************************************************** 
	ma.lens = seq(10, 100, by = 10)
	dv.lens = seq(1, 5, by = 1)

	# precompute indicators
	mas = matrix(double(), nrow(prices), len(ma.lens))
	dvs = matrix(double(), nrow(prices), len(dv.lens))

	for(i in 1:len(ma.lens)) {
		ma.len = ma.lens[i]
		mas[, i] = bt.apply(data, function(x) { SMA(Cl(x), ma.len) } )
	}
	for(i in 1:len(dv.lens)) {
		dv.len = dv.lens[i]
		dvs[,i] = bt.apply(data, function(x) { DV(HLC(x), dv.len, TRUE) } )
	}

	# allocate matrixes to store backtest results
	dummy = matrix(double(), len(ma.lens), 1+len(dv.lens))
		rownames(dummy) = paste('SMA', ma.lens)
		colnames(dummy) = c('NO', paste('DV', dv.lens))

	out = list()
		out$Cagr = dummy
		out$Sharpe = dummy
		out$DVR = dummy
		out$MaxDD = dummy

	# evaluate strategies
	for(ima in 1:len(ma.lens)) {
		sma = mas[, ima]
		cat('SMA =', ma.lens[ima], '\n')

		for(idv in 0:len(dv.lens)) {			
			if( idv == 0 ) {
				data$weight[] = NA
					data$weight[] = iif(prices > sma, 1, 0)			
			} else {
				dv = dvs[, idv]

				data$weight[] = NA
					data$weight[] = iif(prices > sma & dv < 0.25, 1, data$weight)
					data$weight[] = iif(prices < sma & dv > 0.75, 0, data$weight)
			}
			strategy = bt.run(data, silent=T)			

			# add 1 to account for benchmark case, no counter-trend
			idv = idv + 1
			out$Cagr[ima, idv] = compute.cagr(strategy$equity)
			out$Sharpe[ima, idv] = compute.sharpe(strategy$ret)
			out$DVR[ima, idv] = compute.DVR(strategy)
			out$MaxDD[ima, idv] = compute.max.drawdown(strategy$equity)
		}
	}

	#*****************************************************************
	# Create Report
	#****************************************************************** 

png(filename = 'plot3.png', width = 800, height = 600, units = 'px', pointsize = 12, bg = 'white')										

	layout(matrix(1:4,nrow=2))	
	for(i in names(out)) {
		temp = out[[i]]
		temp[] = plota.format( 100 * temp, 1, '', '' )
		plot.table(temp, smain = i, highlight = T, colorbar = F)
	}

dev.off()	

}	


###############################################################################
# Simple, Long-Term Indicator Near to Giving Short Signal By Woodshedder 
# http://ibankcoin.com/woodshedderblog/2011/08/28/simple-long-term-indicator-near-to-giving-short-signal/
###############################################################################
bt.roc.cross.test <- function() 
{	
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')
	tickers = spl('SPY')

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1970-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)		
	bt.prep(data, align='keep.all', dates='1970::2011')

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	prices = data$prices    

	# Buy & Hold	
	data$weight[] = 1
	buy.hold = bt.run(data)	


	# Strategy: calculate the 5 day rate of change (ROC5) and the 252 day rate of change (ROC252).
	#  Buy (or cover short) at the close if yesterday the ROC252 crossed above the ROC5 and today the ROC252 is still above the ROC5.
	#  Sell (or open short) at the close if yesterday the ROC5 crossed above the ROC252 and today the ROC5 is still above the ROC252.
	roc5 = prices / mlag(prices,5)
	roc252 = prices / mlag(prices,252)

	roc5.1 = mlag(roc5,1)
	roc5.2 = mlag(roc5,2)
	roc252.1 = mlag(roc252,1)
	roc252.2 = mlag(roc252,2)

	data$weight[] = NA
		data$weight$SPY[] = iif(roc252.2 < roc5.2 & roc252.1 > roc5.1 & roc252 > roc5, 1, data$weight$SPY)
		data$weight$SPY[] = iif(roc252.2 > roc5.2 & roc252.1 < roc5.1 & roc252 < roc5, -1, data$weight$SPY)
	roc.cross = bt.run(data, trade.summary=T)					
       
	#*****************************************************************
	# Create Report
	#****************************************************************** 	

png(filename = 'plot1.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										
	plotbt.custom.report.part1(roc.cross, buy.hold, trade.summary=T)
dev.off()	

png(filename = 'plot2.png', width = 1200, height = 800, units = 'px', pointsize = 12, bg = 'white')	
	plotbt.custom.report.part2(roc.cross, buy.hold, trade.summary=T)
dev.off()	

png(filename = 'plot3.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')	
	plotbt.custom.report.part3(roc.cross, buy.hold, trade.summary=T)
dev.off()	



	#*****************************************************************
	# Code Strategies
	#****************************************************************** 

	# When shorting always use 	type = 'share' backtest to get realistic results
	# The type = 'weight' backtest assumes that we are constantly adjusting our position
	# to keep all cash = shorts
	data$weight[] = NA
		data$weight$SPY[] = iif(roc252.2 < roc5.2 & roc252.1 > roc5.1 & roc252 > roc5, 1, data$weight$SPY)
		data$weight$SPY[] = iif(roc252.2 > roc5.2 & roc252.1 < roc5.1 & roc252 < roc5, -1, data$weight$SPY)	

		capital = 100000
		data$weight[] = (capital / prices) * bt.exrem(data$weight)
	roc.cross.share = bt.run(data, type='share', trade.summary=T, capital=capital)					


	#*****************************************************************
	# Create Report
	#****************************************************************** 	

png(filename = 'plot4.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										
	plotbt.custom.report.part1(roc.cross.share, roc.cross, buy.hold, trade.summary=T)
dev.off()	

png(filename = 'plot5.png', width = 1200, height = 800, units = 'px', pointsize = 12, bg = 'white')	
	plotbt.custom.report.part2(roc.cross.share, roc.cross, buy.hold, trade.summary=T)
dev.off()	


}



###############################################################################
# Rotational Trading Strategies : ETF Sector Strategy
# http://www.etfscreen.com/sectorstrategy.php
# http://www.etfscreen.com/intlstrategy.php
###############################################################################
bt.rotational.trading.test <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = spl('XLY,XLP,XLE,XLF,XLV,XLI,XLB,XLK,XLU,IWB,IWD,IWF,IWM,IWN,IWO,IWP,IWR,IWS,IWV,IWW,IWZ')	

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1970-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)		
	bt.prep(data, align='keep.all', dates='1970::')

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	prices = data$prices  
	n = len(tickers)  

	# find month ends
	month.ends = endpoints(prices, 'months')
		month.ends = month.ends[month.ends > 0]		

	models = list()

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	dates = '2001::'

	# Equal Weight
	data$weight[] = NA
		data$weight[month.ends,] = ntop(prices, n)[month.ends,]	
	models$equal.weight = bt.run.share(data, clean.signal=F, dates=dates)


	# Rank on 6 month return
	position.score = prices / mlag(prices, 126)	

	# Select Top 2 funds
	data$weight[] = NA
		data$weight[month.ends,] = ntop(position.score[month.ends,], 2)	
	models$top2 = bt.run.share(data, trade.summary=T, dates=dates)

	# Seletop Top 2 funds,  and Keep then till they are in 1:6 rank
	data$weight[] = NA
		data$weight[month.ends,] = ntop.keep(position.score[month.ends,], 2, 6)	
	models$top2.keep6 = bt.run.share(data, trade.summary=T, dates=dates)

	#*****************************************************************
	# Create Report
	#****************************************************************** 

	strategy.performance.snapshoot(models, T)

	# Plot Portfolio Turnover for each strategy
	layout(1)
	barplot.with.labels(sapply(models, compute.turnover, data), 'Average Annual Portfolio Turnover')


	# put all reports into one pdf file
	pdf(file = 'report.pdf', width=8.5, height=11)
		plotbt.custom.report(models, trade.summary=T)
	dev.off()	


png(filename = 'plot1.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										
	plotbt.custom.report.part1(models)
dev.off()	

png(filename = 'plot2.png', width = 1200, height = 800, units = 'px', pointsize = 12, bg = 'white')	
	plotbt.custom.report.part2(models)
dev.off()	

png(filename = 'plot3.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')	
	plotbt.custom.report.part3(models, trade.summary=T)
dev.off()	



}

###############################################################################
# A Quantitative Approach to Tactical Asset Allocation by M. Faber (2006)
# http://www.mebanefaber.com/timing-model/
###############################################################################
bt.timing.model.test <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = spl('VTI,VEU,IEF,VNQ,DBC')	
	tickers = spl('VTI,EFA,IEF,ICF,DBC,SHY')	

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1970-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)		
		for(i in ls(data)) cat( i, format(index(data[[i]][1,]), '%d%b%y'), '\n')

	# extend data for Commodities
	CRB = get.CRB()
		index = max(which( index(CRB) < index(data$DBC[1,]) ))
		scale = as.vector(Cl(data$DBC[1,])) / as.vector(Cl(CRB[(index + 1),]))
		temp = CRB[1 : (index + 1),] * repmat(scale, index + 1, 6)		
	data$DBC = rbind( temp[1:index,], data$DBC )

	bt.prep(data, align='remove.na', dates='1970::2011')

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	prices = data$prices 	
	n = len(tickers)  

	# ignore cash when selecting funds
	position.score = prices
		position.score$SHY = NA

	# find month ends
	month.ends = date.month.ends(index(prices))

	# Equal Weight
	data$weight[] = NA
		data$weight[month.ends,] = ntop(position.score[month.ends,], n)	
		capital = 100000
		data$weight[] = (capital / prices) * data$weight
	equal.weight = bt.run(data, type='share', capital=capital)

	# BuyRule, price > 10 month SMA
	sma = bt.apply.matrix(prices, SMA, 200)
	buy.rule = prices > sma
		buy.rule = ifna(buy.rule, F)

	# Strategy
	weight = ntop(position.score[month.ends,], n)	
		# keep in cash the rest of the funds
		weight[!buy.rule[month.ends,]] = 0
		weight$SHY = 1 - rowSums(weight)

	data$weight[] = NA		
		data$weight[month.ends,] = weight		
		capital = 100000
		data$weight[] = (capital / prices) * data$weight
	timing = bt.run(data, type='share', trade.summary=T, capital=capital)

	#*****************************************************************
	# Code Strategies : Daily
	#****************************************************************** 
	weight = ntop(position.score, n)	
		# keep in cash the rest of the funds
		weight[!buy.rule] = 0
		weight$SHY = 1 - rowSums(weight)

	data$weight[] = NA
		data$weight[] = weight		
		capital = 100000
		data$weight[] = (capital / prices) * data$weight
	timing.d = bt.run(data, type='share', trade.summary=T, capital=capital)	

	#*****************************************************************
	# Create Report
	#****************************************************************** 

	# put all reports into one pdf file
	pdf(file = 'report.pdf', width=8.5, height=11)
		plotbt.custom.report(timing, timing.d, equal.weight, trade.summary=T)
	dev.off()

	#*****************************************************************
	# Code Strategies : Daily with Counter-Trend Entries by david varadi
	# see bt.improving.trend.following.test
	#****************************************************************** 
	dv = bt.apply(data, function(x) { DV(HLC(x), 1, TRUE) } )	

	data$weight[] = NA
		data$weight[] = iif(prices > sma & dv < 0.25, 0.2, data$weight)
		data$weight[] = iif(prices < sma & dv > 0.75, 0, data$weight)
		data$weight$SHY = 0


		data$weight = bt.apply.matrix(data$weight, ifna.prev)
		data$weight$SHY = 1 - rowSums(data$weight)

		data$weight = bt.exrem(data$weight)

		capital = 100000
		data$weight[] = (capital / prices) * data$weight
	timing.d1 = bt.run(data, type='share', trade.summary=T, capital=capital)

	# compute turnover	
	models = variable.number.arguments(timing.d1, timing.d, timing, equal.weight)
		sapply(models, compute.turnover, data)


	#*****************************************************************
	# Create Report
	#****************************************************************** 

	plotbt.custom.report.part1(timing.d1, timing.d, timing, equal.weight)

}

###############################################################################
# Monthly End-of-the-Month (MEOM) by Quanting Dutchman
# http://quantingdutchman.wordpress.com/2010/06/30/strategy-2-monthly-end-of-the-month-meom/
###############################################################################
bt.meom.test <- function() 
{	
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = spl('DIA,EEM,EFA,EWH,EWJ,EWT,EWZ,FXI,GLD,GSG,IEF,ILF,IWM,IYR,QQQ,SPY,VNQ,XLB,XLE,XLF,XLI,XLP,XLU,XLV,XLY,XLK')	

	# Alternatively use Dow Jones Components
	# tickers = dow.jones.components()

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1995-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)	
	bt.prep(data, align='keep.all', dates='1995::')

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	prices = data$prices   
	n = ncol(prices)
	nperiods = nrow(prices)

	# Equal Weight
	data$weight[] = ntop(prices, n)
	equal.weight = bt.run(data)	


	# find month ends
	month.ends = endpoints(prices, 'months')
		month.ends = month.ends[month.ends > 0]		
	month.ends2 = iif(month.ends + 2 > nperiods, nperiods, month.ends + 2)

	# Strategy MEOM - Equal Weight
	data$weight[] = NA
		data$weight[month.ends,] = ntop(prices, n)[month.ends,]	
		data$weight[month.ends2,] = 0

		capital = 100000
		data$weight[] = (capital / prices) * data$weight
	meom.equal.weight = bt.run(data, type='share', capital=capital)

	#*****************************************************************
	# Rank1 = MA( C/Ref(C,-2), 5 ) * MA( C/Ref(C,-2), 40 )
	#****************************************************************** 

	# BuyRule = C > WMA(C, 89)
	buy.rule = prices > bt.apply.matrix(prices, function(x) { WMA(x, 89) } )		
		buy.rule = ifna(buy.rule, F)

	# 2-day returns
	ret2 = ifna(prices / mlag(prices, 2), 0)

	# Rank1 = MA( C/Ref(C,-2), 5 ) * MA( C/Ref(C,-2), 40 )
	position.score = bt.apply.matrix(ret2, SMA, 5) * bt.apply.matrix(ret2, SMA, 40)
		position.score[!buy.rule] = NA

	# Strategy MEOM - top 2    
	data$weight[] = NA;
		data$weight[month.ends,] = ntop(position.score[month.ends,], 2)		
		data$weight[month.ends2,] = 0		

		capital = 100000
		data$weight[] = (capital / prices) * data$weight
	meom.top2.rank1 = bt.run(data, type='share', trade.summary=T, capital=capital)

	#*****************************************************************
	# Rank2 = MA( C/Ref(C,-2), 5 ) * Ref( MA( C/Ref(C,-2), 10 ), -5 )
	#****************************************************************** 	

	# Rank2 = MA( C/Ref(C,-2), 5 ) * Ref( MA( C/Ref(C,-2), 10 ), -5 )
	position.score = bt.apply.matrix(ret2, SMA, 5) * mlag( bt.apply.matrix(ret2, SMA, 10), 5)
		position.score[!buy.rule] = NA

	# Strategy MEOM - top 2    
	data$weight[] = NA
		data$weight[month.ends,] = ntop(position.score[month.ends,], 2)		
		data$weight[month.ends2,] = 0		

		capital = 100000
		data$weight[] = (capital / prices) * data$weight
	meom.top2.rank2 = bt.run(data, type='share', trade.summary=T, capital=capital)

	#*****************************************************************
	# Create Report
	#****************************************************************** 

	# put all reports into one pdf file
	pdf(file = 'report.pdf', width=8.5, height=11)
		plotbt.custom.report(meom.top2.rank2, meom.top2.rank1, meom.equal.weight, equal.weight, trade.summary=T)
	dev.off()	


png(filename = 'plot1.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										
	plotbt.custom.report.part1(meom.top2.rank2, meom.top2.rank1, meom.equal.weight, equal.weight, trade.summary=T)
dev.off()	

png(filename = 'plot2.png', width = 1200, height = 800, units = 'px', pointsize = 12, bg = 'white')	
	plotbt.custom.report.part2(meom.top2.rank2, meom.top2.rank1, meom.equal.weight, equal.weight, trade.summary=T)
dev.off()	

png(filename = 'plot3.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')	
	plotbt.custom.report.part3(meom.top2.rank2, meom.top2.rank1, meom.equal.weight, equal.weight, trade.summary=T)
dev.off()	

	#*****************************************************************
	# Modify MEOM logic -  maybe sell in 1 day
	#****************************************************************** 

	month.ends1 = iif(month.ends + 1 > nperiods, nperiods, month.ends + 1)

	# Strategy MEOM - top 2, maybe sell in 1 day
	data$weight[] = NA
		data$weight[month.ends,] = ntop(position.score[month.ends,], 2)		
		data$weight[month.ends2,] = 0		

		# Close next day if Today's Close > Today's Open
		popen = bt.apply(data, Op)
		data$weight[month.ends1,] = iif((prices > popen)[month.ends1,], 0, NA)		

		capital = 100000
		data$weight[] = (capital / prices) * data$weight
	meom.top2.rank2.hold12 = bt.run(data, type='share', trade.summary=T, capital=capital)

png(filename = 'plot4.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										
	plotbt.custom.report.part1(meom.top2.rank2.hold12, meom.top2.rank2, meom.top2.rank1, meom.equal.weight, equal.weight, trade.summary=T)
dev.off()	

png(filename = 'plot5.png', width = 1200, height = 800, units = 'px', pointsize = 12, bg = 'white')	
	plotbt.custom.report.part2(meom.top2.rank2.hold12, meom.top2.rank2, meom.top2.rank1, meom.equal.weight, equal.weight, trade.summary=T)
dev.off()	


}


###############################################################################
# Intraday Backtest
# The FX intraday free data was 
# http://www.fxhistoricaldata.com/EURUSD/
###############################################################################
bt.intraday.test <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	

	EURUSD = getSymbols.fxhistoricaldata('EURUSD', 'hour', auto.assign = F, download=F)
	SPY = getSymbols('SPY', src = 'yahoo', from = '1980-01-01', auto.assign = F)


	#*****************************************************************
	# Reference intraday period
	#****************************************************************** 
png(filename = 'plot1.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')											
	plota(EURUSD['2012:03:06 10::2012:03:06 21'], type='candle', main='EURUSD on 2012:03:06 from 10 to 21')
dev.off()			

	#*****************************************************************
	# Plot hourly and daily prices on the same chart
	#****************************************************************** 	
png(filename = 'plot2.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										

	# two Y axis plot	
	dates= '2012:01:01::2012:01:11'
	y = SPY[dates]
	plota(y, type = 'candle', LeftMargin=3)

	y = EURUSD[dates]
	plota2Y(y, ylim = range(OHLC(y), na.rm=T), las=1, col='red', col.axis = 'red')
		plota.ohlc(y, col=plota.candle.col(y))
	plota.legend('SPY(rhs),EURUSD(lhs)', 'black,red', list(SPY[dates],EURUSD[dates]))

dev.off()	


	#*****************************************************************
	# Universe: Currency Majors
	# http://en.wikipedia.org/wiki/Currency_pair	
	#****************************************************************** 
	tickers = spl('EURUSD,USDJPY,GBPUSD,AUDUSD,USDCHF,USDCAD')

	#*****************************************************************
	# Daily Backtest
	#****************************************************************** 
	data <- new.env()
	getSymbols.fxhistoricaldata(tickers, 'day', data, download=F)
	bt.prep(data, align='remove.na', dates='1990::')

	prices = data$prices   
	n = len(tickers)  
	models = list()

	# Equal Weight
	data$weight[] = NA
		data$weight[] = ntop(prices, n)
	models$equal.weight = bt.run.share(data, clean.signal=F)

	# Timing by M. Faber
	sma = bt.apply.matrix(prices, SMA, 200)
	data$weight[] = NA
		data$weight[] = ntop(prices, n) * (prices > sma)
	models$timing = bt.run.share(data, clean.signal=F)

	# Report
	models = rev(models)
png(filename = 'plot3.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										
	plotbt.custom.report.part1(models)
dev.off()	
png(filename = 'plot4.png', width = 1200, height = 800, units = 'px', pointsize = 12, bg = 'white')	
	plotbt.custom.report.part2(models)
dev.off()	

	#*****************************************************************
	# Intraday Backtest
	#****************************************************************** 
	data <- new.env()	
	getSymbols.fxhistoricaldata(tickers, 'hour', data, download=F)	
	bt.prep(data, align='remove.na', dates='1990::')

	prices = data$prices   
	n = len(tickers)  
	models = list()

	# Equal Weight
	data$weight[] = NA
		data$weight[] = ntop(prices, n)
	models$equal.weight = bt.run.share(data, clean.signal=F)

	# Timing by M. Faber
	sma = bt.apply.matrix(prices, SMA, 200)
	data$weight[] = NA
		data$weight[] = ntop(prices, n) * (prices > sma)
	models$timing = bt.run.share(data, clean.signal=F)

	# Report
	models = rev(models)
png(filename = 'plot5.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										
	plotbt.custom.report.part1(models)
dev.off()	
png(filename = 'plot6.png', width = 1200, height = 800, units = 'px', pointsize = 12, bg = 'white')	
	plotbt.custom.report.part2(models)
dev.off()	

}	






###############################################################################
# Forecast-Free Algorithms: A New Benchmark For Tactical Strategies
# Rebalancing was done on a weekly basis and quarterly data was used to estimate correlations.
# http://cssanalytics.wordpress.com/2011/08/09/forecast-free-algorithms-a-new-benchmark-for-tactical-strategies/
#
# Minimum Variance Sector Rotation
# http://quantivity.wordpress.com/2011/04/20/minimum-variance-sector-rotation/
#
# The volatility mystery continues
# http://www.portfolioprobe.com/2011/12/05/the-volatility-mystery-continues/
###############################################################################
bt.min.var.test <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod,quadprog,lpSolve')
	tickers = spl('SPY,QQQ,EEM,IWM,EFA,TLT,IYR,GLD')


	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1980-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)

	data.weekly <- new.env()
		for(i in tickers) data.weekly[[i]] = to.weekly(data[[i]], indexAt='endof')

	bt.prep(data, align='remove.na', dates='1990::')
	bt.prep(data.weekly, align='remove.na', dates='1990::')

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	prices = data$prices   
	n = ncol(prices)

	# find week ends
	week.ends = endpoints(prices, 'weeks')
		week.ends = week.ends[week.ends > 0]		


	# Equal Weight 1/N Benchmark
	data$weight[] = NA
		data$weight[week.ends,] = ntop(prices[week.ends,], n)		

		capital = 100000
		data$weight[] = (capital / prices) * data$weight
	equal.weight = bt.run(data, type='share', capital=capital)

	#*****************************************************************
	# Create Constraints
	#*****************************************************************
	constraints = new.constraints(n, lb = -Inf, ub = +Inf)
	#constraints = new.constraints(n, lb = 0, ub = 1)

	# SUM x.i = 1
	constraints = add.constraints(rep(1, n), 1, type = '=', constraints)		


	ret = prices / mlag(prices) - 1
	weight = coredata(prices)
		weight[] = NA

	for( i in week.ends[week.ends >= (63 + 1)] ) {
		# one quarter = 63 days
		hist = ret[ (i- 63 +1):i, ]

		# create historical input assumptions
		ia = create.ia(hist)
			s0 = apply(coredata(hist),2,sd)		
			ia$cov = cor(coredata(hist), use='complete.obs',method='pearson') * (s0 %*% t(s0))

		weight[i,] = min.risk.portfolio(ia, constraints)
	}

	# Minimum Variance
	data$weight[] = weight		
		capital = 100000
		data$weight[] = (capital / prices) * data$weight
	min.var.daily = bt.run(data, type='share', capital=capital)

	#*****************************************************************
	# Code Strategies: Weekly
	#****************************************************************** 

	retw = data.weekly$prices / mlag(data.weekly$prices) - 1
	weightw = coredata(prices)
		weightw[] = NA

	for( i in week.ends[week.ends >= (63 + 1)] ) {	
		# map
		j = which(index(ret[i,]) == index(retw))

		# one quarter = 13 weeks
		hist = retw[ (j- 13 +1):j, ]

		# create historical input assumptions
		ia = create.ia(hist)
			s0 = apply(coredata(hist),2,sd)		
			ia$cov = cor(coredata(hist), use='complete.obs',method='pearson') * (s0 %*% t(s0))

		weightw[i,] = min.risk.portfolio(ia, constraints)
	}	

	data$weight[] = weightw		
		capital = 100000
		data$weight[] = (capital / prices) * data$weight
	min.var.weekly = bt.run(data, type='share', capital=capital, trade.summary = T)
	#min.var.weekly$trade.summary$trades
	#*****************************************************************
	# Create Report
	#****************************************************************** 


png(filename = 'plot1.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										
	plotbt.custom.report.part1(min.var.weekly, min.var.daily, equal.weight)
dev.off()	

png(filename = 'plot2.png', width = 1200, height = 800, units = 'px', pointsize = 12, bg = 'white')	
	plotbt.custom.report.part2(min.var.weekly, min.var.daily, equal.weight)
dev.off()	

png(filename = 'plot3.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										
	layout(1:2)
	plotbt.transition.map(min.var.daily$weight)
		legend('topright', legend = 'min.var.daily', bty = 'n')
	plotbt.transition.map(min.var.weekly$weight)
		legend('topright', legend = 'min.var.weekly', bty = 'n')
dev.off()	

}


###############################################################################
# Backtest various asset allocation strategies based on the idea
# Forecast-Free Algorithms: A New Benchmark For Tactical Strategies
# http://cssanalytics.wordpress.com/2011/08/09/forecast-free-algorithms-a-new-benchmark-for-tactical-strategies/
#
# Extension to http://systematicinvestor.wordpress.com/2011/12/13/backtesting-minimum-variance-portfolios/
###############################################################################
bt.aa.test <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod,quadprog,corpcor,lpSolve')
	tickers = spl('SPY,QQQ,EEM,IWM,EFA,TLT,IYR,GLD')
	#tickers = dow.jones.components()


	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1980-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)							
	bt.prep(data, align='remove.na', dates='1990::2011')
 

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	prices = data$prices   
	n = ncol(prices)

	# find week ends
	period.ends = endpoints(prices, 'weeks')
			period.annual.factor = 52

#	period.ends = endpoints(prices, 'months')
#			period.annual.factor = 12

		period.ends = period.ends[period.ends > 0]

	#*****************************************************************
	# Create Constraints
	#*****************************************************************
	constraints = new.constraints(n, lb = 0, ub = 1)

	# SUM x.i = 1
	constraints = add.constraints(rep(1, n), 1, type = '=', constraints)		

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 		
	ret = prices / mlag(prices) - 1
	start.i = which(period.ends >= (63 + 1))[1]

	#min.risk.fns = spl('min.risk.portfolio,min.maxloss.portfolio,min.mad.portfolio,min.cvar.portfolio,min.cdar.portfolio,min.cor.insteadof.cov.portfolio,min.mad.downside.portfolio,min.risk.downside.portfolio,min.avgcor.portfolio,find.erc.portfolio,min.gini.portfolio')	
	min.risk.fns = spl('min.risk.portfolio,min.maxloss.portfolio')

	# Gini risk measure optimization takes a while, uncomment below to add Gini risk measure
	# min.risk.fns = c(min.risk.fns, 'min.gini.portfolio')

	weight = NA * prices[period.ends,]
	weights = list()
		# Equal Weight 1/N Benchmark
		weights$equal.weight = weight
			weights$equal.weight[] = ntop(prices[period.ends,], n)	
			weights$equal.weight[1:start.i,] = NA

		for(f in min.risk.fns) weights[[ gsub('\\.portfolio', '', f) ]] = weight

	risk.contributions = list()	
		for(f in names(weights)) risk.contributions[[ f ]] = weight

	# construct portfolios			
	for( j in start.i:len(period.ends) ) {
		i = period.ends[j]

		# one quarter = 63 days
		hist = ret[ (i- 63 +1):i, ]

		include.index = rep(TRUE, n)
# new logic, require all assets to have full price history
#include.index = count(hist)== 63       
#hist = hist[ , include.index]


		# create historical input assumptions
		ia = create.ia(hist)
			s0 = apply(coredata(hist),2,sd)		
			ia$correlation = cor(coredata(hist), use='complete.obs',method='pearson')
			ia$cov = ia$correlation * (s0 %*% t(s0))

		# find optimal portfolios under different risk measures
		for(f in min.risk.fns) {
			# set up initial solution
			constraints$x0 = weights[[ gsub('\\.portfolio', '', f) ]][(j-1), include.index]

			weights[[ gsub('\\.portfolio', '', f) ]][j, include.index] = match.fun(f)(ia, constraints)
		}


		# compute risk contributions implied by portfolio weihgts
		for(f in names(weights)) {
			risk.contributions[[ f ]][j, include.index] = portfolio.risk.contribution(weights[[ f ]][j, include.index], ia)
		}

		if( j %% 10 == 0) cat(j, '\n')
	}

	#*****************************************************************
	# Create strategies
	#****************************************************************** 		
	models = list()
	for(i in names(weights)) {
		data$weight[] = NA
			data$weight[period.ends,] = weights[[i]]	
		models[[i]] = bt.run.share(data, clean.signal = F)
	}

	#*****************************************************************
	# Create Report
	#****************************************************************** 
	models = rev(models)
		weights = rev(weights)
		risk.contributions = rev(risk.contributions)

png(filename = 'plot1.png', width = 800, height = 600, units = 'px', pointsize = 12, bg = 'white')										
	# Plot perfromance
	plotbt(models, plotX = T, log = 'y', LeftMargin = 3)	    	
		mtext('Cumulative Performance', side = 2, line = 1)
dev.off()	

png(filename = 'plot2.png', width = 1200, height = 800, units = 'px', pointsize = 12, bg = 'white')		
	# Plot Strategy Statistics  Side by Side
	plotbt.strategy.sidebyside(models)
dev.off()	


png(filename = 'plot3.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')		
	# Plot Portfolio Turnover for each strategy
	layout(1)
	barplot.with.labels(sapply(models, compute.turnover, data), 'Average Annual Portfolio Turnover')
dev.off()	



png(filename = 'plot4.png', width = 600, height = 1600, units = 'px', pointsize = 12, bg = 'white')	
	# Plot transition maps
	layout(1:len(models))
	for(m in names(models)) {
		plotbt.transition.map(models[[m]]$weight, name=m)
			legend('topright', legend = m, bty = 'n')
	}
dev.off()	

png(filename = 'plot5.png', width = 600, height = 1600, units = 'px', pointsize = 12, bg = 'white')	
	# Plot risk contributions
	layout(1:len(risk.contributions))
	for(m in names(risk.contributions)) {
		plotbt.transition.map(risk.contributions[[m]], name=paste('Risk Contributions',m))
			legend('topright', legend = m, bty = 'n')
	}
dev.off()	


png(filename = 'plot6.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')		
	# Plot portfolio concentration stats
	layout(1:2)	
	plota.matplot(lapply(weights, portfolio.concentration.gini.coefficient), main='Gini Coefficient')
	plota.matplot(lapply(weights, portfolio.concentration.herfindahl.index), main='Herfindahl Index')
	#plota.matplot(lapply(weights, portfolio.turnover), main='Turnover')
dev.off()	


png(filename = 'plot7.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')		
	# Compute stats
	out = compute.stats(weights,
		list(Gini=function(w) mean(portfolio.concentration.gini.coefficient(w), na.rm=T),
			Herfindahl=function(w) mean(portfolio.concentration.herfindahl.index(w), na.rm=T),
			Turnover=function(w) period.annual.factor * mean(portfolio.turnover(w), na.rm=T)
			)
		)

	out[] = plota.format(100 * out, 1, '', '%')
	plot.table(t(out))
dev.off()		


png(filename = 'plot8.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')		
	# Plot Portfolio Turnover for each strategy
	layout(1)
	barplot.with.labels(sapply(weights, function(w) period.annual.factor * mean(portfolio.turnover(w), na.rm=T)), 'Average Annual Portfolio Turnover')
dev.off()	

}

bt.aa.test.new <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod,quadprog,corpcor,lpSolve')
	tickers = spl('SPY,QQQ,EEM,IWM,EFA,TLT,IYR,GLD')

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1980-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)							
	bt.prep(data, align='remove.na', dates='1990::') 

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 					
	cluster.group = cluster.group.kmeans.90

	obj = portfolio.allocation.helper(data$prices, 
		periodicity = 'months', lookback.len = 60, 
		min.risk.fns = list(
			EW=equal.weight.portfolio,
			RP=risk.parity.portfolio,
			MD=max.div.portfolio,						

			MV=min.var.portfolio,
			MVE=min.var.excel.portfolio,
			MV2=min.var2.portfolio,

			MC=min.corr.portfolio,
			MCE=min.corr.excel.portfolio,
			MC2=min.corr2.portfolio,

			MS=max.sharpe.portfolio(),
			ERC = equal.risk.contribution.portfolio,

			# target retunr / risk
			TRET.12 = target.return.portfolio(12/100),								
			TRISK.10 = target.risk.portfolio(10/100),

			# cluster
			C.EW = distribute.weights(equal.weight.portfolio, cluster.group),
			C.RP = distribute.weights(risk.parity.portfolio, cluster.group),

			# rso
			RSO.RP.5 = rso.portfolio(risk.parity.portfolio, 5, 500), 

			# others
			MMaxLoss = min.maxloss.portfolio,
			MMad = min.mad.portfolio,
			MCVaR = min.cvar.portfolio,
			MCDaR = min.cdar.portfolio,
			MMadDown = min.mad.downside.portfolio,
			MRiskDown = min.risk.downside.portfolio,
			MCorCov = min.cor.insteadof.cov.portfolio
		)
	)

	models = create.strategies(obj, data)$models

    #*****************************************************************
    # Create Report
    #******************************************************************    
    # put all reports into one pdf file
	#pdf(file = 'filename.pdf', width=8.5, height=11)

png(filename = 'plot1.png', width = 1800, height = 1800, units = 'px', pointsize = 12, bg = 'white')	
		strategy.performance.snapshoot(models, T, 'Backtesting Asset Allocation portfolios')
dev.off()



	# close pdf file
    #dev.off()	
    
	#pdf(file = 'filename.pdf', width=18.5, height=21)
	#	strategy.performance.snapshoot(models, title = 'Backtesting Asset Allocation portfolios', data = data)
	#dev.off()	
    
	# to see last 5 re-balances
	# round(100 * last(models$MCDaR$weight[obj$period.ends[-len(obj$period.ends)]+1], 5))
}





###############################################################################
# Investigate Rebalancing methods:
# 1. Periodic Rebalancing: rebalance to the target mix every month, quarter, year.
# 2. Maximum Deviation Rebalancing: rebalance to the target mix when asset weights deviate more than a given percentage from the target mix.
# 3. Same as 2, but rebalance half-way to target
###############################################################################
bt.rebalancing.test <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')
	tickers = spl('SPY,TLT')

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1900-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)
	bt.prep(data, align='remove.na', dates='1900::2011')

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	prices = data$prices   
	nperiods = nrow(prices)
	target.allocation = matrix(c(0.5, 0.5), nrow=1)

	# Buy & Hold	
	data$weight[] = NA	
		data$weight[1,] = target.allocation
		capital = 100000
		data$weight[] = (capital / prices) * data$weight
	buy.hold = bt.run(data, type='share', capital=capital)


	# Rebalance periodically
	models = list()
	for(period in spl('months,quarters,years')) {
		data$weight[] = NA	
			data$weight[1,] = target.allocation

			period.ends = endpoints(prices, period)
				period.ends = period.ends[period.ends > 0]		
			data$weight[period.ends,] = repmat(target.allocation, len(period.ends), 1)

			capital = 100000
			data$weight[] = (capital / prices) * data$weight
		models[[period]] = bt.run(data, type='share', capital=capital)	
	}
	models$buy.hold = buy.hold				

	# Compute Portfolio Turnover 
	compute.turnover(models$years, data)		

	# Compute Portfolio Maximum Deviation
	compute.max.deviation(models$years, target.allocation)		

	#*****************************************************************
	# Create Report
	#****************************************************************** 				
	# put all reports into one pdf file
	pdf(file = 'report.pdf', width=8.5, height=11)
		plotbt.custom.report(models)
	dev.off()	

png(filename = 'plot1.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										
	plotbt.custom.report.part1(models)
dev.off()	

png(filename = 'plot2.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')
	# Plot BuyHold and Monthly Rebalancing Weights
	layout(1:2)
	plotbt.transition.map(models$buy.hold$weight, 'buy.hold', spl('red,orange'))
		abline(h=50)
	plotbt.transition.map(models$months$weight, 'months', spl('red,orange'))
		abline(h=50)		
dev.off()

png(filename = 'plot3.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')		
	# Plot Portfolio Turnover for each Rebalancing method
	layout(1)
	barplot.with.labels(sapply(models, compute.turnover, data), 'Average Annual Portfolio Turnover')
dev.off()	

	#*****************************************************************
	# Code Strategies that rebalance based on maximum deviation
	#****************************************************************** 

	# rebalance to target.allocation when portfolio weights are 5% away from target.allocation
	models$smart5.all = bt.max.deviation.rebalancing(data, buy.hold, target.allocation, 5/100, 0) 

	# rebalance half-way to target.allocation when portfolio weights are 5% away from target.allocation
	models$smart5.half = bt.max.deviation.rebalancing(data, buy.hold, target.allocation, 5/100, 0.5) 

	#*****************************************************************
	# Create Report
	#****************************************************************** 			

png(filename = 'plot4.png', width = 600, height = 800, units = 'px', pointsize = 12, bg = 'white')
	# Plot BuyHold, Years and Max Deviation Rebalancing Weights	
	layout(1:4)
	plotbt.transition.map(models$buy.hold$weight, 'buy.hold', spl('red,orange'))
		abline(h=50)
	plotbt.transition.map(models$smart5.all$weight, 'Max Deviation 5%, All the way', spl('red,orange'))
		abline(h=50)
	plotbt.transition.map(models$smart5.half$weight, 'Max Deviation 5%, Half the way', spl('red,orange'))
		abline(h=50)
	plotbt.transition.map(models$years$weight, 'years', spl('red,orange'))
		abline(h=50)
dev.off()	

png(filename = 'plot5.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')		
	# Plot Portfolio Turnover for each Rebalancing method
	layout(1:2)
	barplot.with.labels(sapply(models, compute.turnover, data), 'Average Annual Portfolio Turnover', F)
	barplot.with.labels(sapply(models, compute.max.deviation, target.allocation), 'Maximum Deviation from Target Mix')
dev.off()

png(filename = 'plot6.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')		
	# Plot Strategy Statistics  Side by Side
	plotbt.strategy.sidebyside(models)
dev.off()	

	#*****************************************************************
	# Periodic Rebalancing Seasonality
	#****************************************************************** 			
	# maQuant annual rebalancing (september/october showed the best results)	
	months = spl('Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec')		
	period.ends = endpoints(prices, 'months')
		period.ends = period.ends[period.ends > 0]		
	models = list()
	for(i in 1:12) {
		index = which( date.month(index(prices)[period.ends]) == i )
		data$weight[] = NA	
			data$weight[1,] = target.allocation			
			data$weight[period.ends[index],] = repmat(target.allocation, len(index), 1)

			capital = 100000
			data$weight[] = (capital / prices) * data$weight
		models[[ months[i] ]] = bt.run(data, type='share', capital=capital)	
	}

png(filename = 'plot7.png', width = 1200, height = 500, units = 'px', pointsize = 12, bg = 'white')		
	plotbt.strategy.sidebyside(models)
dev.off()	

	layout(1)
	barplot.with.labels(sapply(models, compute.turnover, data), 'Average Annual Portfolio Turnover')
}


# Rebalancing method based on maximum deviation
bt.max.deviation.rebalancing <- function
(
	data,
	model, 
	target.allocation, 
	max.deviation = 3/100, 
	rebalancing.ratio = 0,	# 0 means rebalance all-way to target.allocation
							# 0.5 means rebalance half-way to target.allocation
	start.index = 1,
	period.ends = 1:nrow(model$weight)							
) 
{
	nperiods = nrow(model$weight)
	action.index = rep(F, nperiods)

	start.index = period.ends[start.index]
	start.index0 = start.index

	while(T) {	
		# find rows that violate max.deviation
		weight = model$weight
		index = apply(abs(weight - rep.row(target.allocation, nperiods)), 1, max) > max.deviation
		index = which( index[period.ends] )

		if( len(index) > 0 ) {
			index = period.ends[index]
			index = index[ index > start.index ]

			if( len(index) > 0 ) {
				action.index[index[1]] = T

				data$weight[] = NA	
					data$weight[start.index0,] = target.allocation

					temp = rep.row(target.allocation, sum(action.index))
					data$weight[action.index,] = temp + 
						rebalancing.ratio * (weight[action.index,] - temp)					

				model = bt.run.share(data, clean.signal=F, silent=T)

				start.index = index[1]
			} else break			
		} else break		
	}
	return(model)
}








bt.rebalancing1.test <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')
	# SHY - cash
	tickers = spl('SPY,TLT,GLD,FXE,USO,SHY')

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1900-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)
	bt.prep(data, align='remove.na', dates='1900::2011')

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	prices = data$prices   
	nperiods = nrow(prices)
	target.allocation = matrix(rep(1/6,6), nrow=1)

	# Buy & Hold	
	data$weight[] = NA	
		data$weight[1,] = target.allocation
		capital = 100000
		data$weight[] = (capital / prices) * data$weight
	buy.hold = bt.run(data, type='share', capital=capital)


	# Rebalance periodically
	models = list()
	for(period in spl('months,quarters,years')) {
		data$weight[] = NA	
			data$weight[1,] = target.allocation

			period.ends = endpoints(prices, period)
				period.ends = period.ends[period.ends > 0]		
			data$weight[period.ends,] = repmat(target.allocation, len(period.ends), 1)

			capital = 100000
			data$weight[] = (capital / prices) * data$weight
		models[[period]] = bt.run(data, type='share', capital=capital)	
	}
	models$buy.hold = buy.hold				


	#*****************************************************************
	# Code Strategies that rebalance based on maximum deviation
	#****************************************************************** 

	# rebalance to target.allocation when portfolio weights are 3% away from target.allocation
	models$smart3.all = bt.max.deviation.rebalancing(data, buy.hold, target.allocation, 3/100, 0) 

	# rebalance half-way to target.allocation when portfolio weights are 3% away from target.allocation
	models$smart3.half = bt.max.deviation.rebalancing(data, buy.hold, target.allocation, 3/100, 0.5) 

	#*****************************************************************
	# Create Report
	#****************************************************************** 			

png(filename = 'plot1.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')		

	# Plot Portfolio Turnover for each Rebalancing method
	layout(1:2)
	barplot.with.labels(sapply(models, compute.turnover, data), 'Average Annual Portfolio Turnover', F)
	barplot.with.labels(sapply(models, compute.max.deviation, target.allocation), 'Maximum Deviation from Target Mix')


dev.off()

png(filename = 'plot2.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')		
	# Plot Strategy Statistics  Side by Side
	plotbt.strategy.sidebyside(models)
dev.off()	

}


###############################################################################
# Rotational Trading: how to reduce trades and improve returns by Frank Hassler
# http://engineering-returns.com/2011/07/06/rotational-trading-how-to-reducing-trades-and-improve-returns/
###############################################################################
# Custom Summary function to replicate tables from Engineering Returns
engineering.returns.kpi <- function
(
	bt,		# backtest object
	trade.summary = NULL
) 
{	
	if( !is.null(bt$trade.summary) ) trade.summary = bt$trade.summary

	out = list()
	out$Period = join( format( range(index(bt$equity)), '%b%Y'), ' - ')

	out$Cagr = compute.cagr(bt$equity)
	out$DVR = compute.DVR(bt)
	out$Sharpe = compute.sharpe(bt$ret)		
	out$R2 = compute.R2(bt$equity)

	if( !is.null(trade.summary) ) {
		out$Win.Percent = trade.summary$stats['win.prob', 'All']
		out$Avg.Trade = trade.summary$stats['avg.pnl', 'All']
	}

	out$MaxDD = compute.max.drawdown(bt$equity)

	# format
	out = lapply(out, function(x) if(is.double(x)) round(100*x,1) else x)

	if( !is.null(trade.summary) ) out$Num.Trades = trade.summary$stats['ntrades', 'All']			

	return( list(System=out))
}


bt.rotational.trading.trades.test <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = spl('XLY,XLP,XLE,XLF,XLV,XLI,XLB,XLK,XLU,IWB,IWD,IWF,IWM,IWN,IWO,IWP,IWR,IWS,IWV,IWW,IWZ')

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1970-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)		
	bt.prep(data, align='remove.na', dates='1970::2011')

	#*****************************************************************
	# Code Strategies : weekly rebalancing
	#****************************************************************** 
	prices = data$prices  
	n = len(tickers)  

	# find week ends
	week.ends = endpoints(prices, 'weeks')
		week.ends = week.ends[week.ends > 0]		


	# Rank on ROC 200
	position.score = prices / mlag(prices, 200)	
		position.score.ma = position.score		
		buy.rule = T

	# Select Top 2 funds daily
	data$weight[] = NA
		data$weight[] = ntop(position.score, 2)	
		capital = 100000
		data$weight[] = (capital / prices) * bt.exrem(data$weight)				
	top2.d = bt.run(data, type='share', trade.summary=T, capital=capital)

	# Select Top 2 funds weekly
	data$weight[] = NA
		data$weight[week.ends,] = ntop(position.score[week.ends,], 2)	
		capital = 100000
		data$weight[] = (capital / prices) * bt.exrem(data$weight)		
	top2.w = bt.run(data, type='share', trade.summary=T, capital=capital)

png(filename = 'plot1.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')		
	# Plot Strategy Metrics Side by Side
	plotbt.strategy.sidebyside(top2.d, top2.w, perfromance.fn = 'engineering.returns.kpi')	
dev.off()

	#*****************************************************************
	# Code Strategies : different entry/exit rank
	#****************************************************************** 

	# Select Top 2 funds, Keep till they are in 4/6 rank
	data$weight[] = NA
		data$weight[] = ntop.keep(position.score, 2, 4)	
		capital = 100000
		data$weight[] = (capital / prices) * bt.exrem(data$weight)		
	top2.d.keep4 = bt.run(data, type='share', trade.summary=T, capital=capital)

	data$weight[] = NA
		data$weight[] = ntop.keep(position.score, 2, 6)	
		capital = 100000
		data$weight[] = (capital / prices) * bt.exrem(data$weight)		
	top2.d.keep6 = bt.run(data, type='share', trade.summary=T, capital=capital)

png(filename = 'plot2.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')				
	# Plot Strategy Metrics Side by Side
	plotbt.strategy.sidebyside(top2.d, top2.d.keep4, top2.d.keep6, perfromance.fn = 'engineering.returns.kpi')
dev.off()

	#*****************************************************************
	# Code Strategies : Rank smoothing
	#****************************************************************** 

	models = list()
	models$Bench = top2.d
	for( avg in spl('SMA,EMA') ) {
		for( i in c(3,5,10,20) ) {		
			position.score.smooth = bt.apply.matrix(position.score.ma, avg, i)	
				position.score.smooth[!buy.rule,] = NA

			data$weight[] = NA
				data$weight[] = ntop(position.score.smooth, 2)	
				capital = 100000
				data$weight[] = (capital / prices) * bt.exrem(data$weight)		
			models[[ paste(avg,i) ]] = bt.run(data, type='share', trade.summary=T, capital=capital)		
		}
	}

png(filename = 'plot3.png', width = 1200, height = 600, units = 'px', pointsize = 12, bg = 'white')				
	# Plot Strategy Metrics Side by Side
	plotbt.strategy.sidebyside(models, perfromance.fn = 'engineering.returns.kpi')
dev.off()

	#*****************************************************************
	# Code Strategies : Combination
	#****************************************************************** 

	# Select Top 2 funds daily, Keep till they are 6 rank, Smooth Rank by 10 day EMA
	position.score.smooth = bt.apply.matrix(position.score.ma, 'EMA', 10)	
		position.score.smooth[!buy.rule,] = NA
	data$weight[] = NA
		data$weight[] = ntop.keep(position.score.smooth, 2, 6)	
		capital = 100000
		data$weight[] = (capital / prices) * bt.exrem(data$weight)		
	top2.d.keep6.EMA10 = bt.run(data, type='share', trade.summary=T, capital=capital)

	# Select Top 2 funds weekly, Keep till they are 6 rank
	data$weight[] = NA
		data$weight[week.ends,] = ntop.keep(position.score[week.ends,], 2, 6)	
		capital = 100000
		data$weight[] = (capital / prices) * bt.exrem(data$weight)		
	top2.w.keep6 = bt.run(data, type='share', trade.summary=T, capital=capital)

	# Select Top 2 funds weekly, Keep till they are 6 rank, Smooth Rank by 10 week EMA
	position.score.smooth[] = NA
		position.score.smooth[week.ends,] = bt.apply.matrix(position.score.ma[week.ends,], 'EMA', 10)	
			position.score.smooth[!buy.rule,] = NA

	data$weight[] = NA
		data$weight[week.ends,] = ntop.keep(position.score.smooth[week.ends,], 2, 6)	
		capital = 100000
		data$weight[] = (capital / prices) * bt.exrem(data$weight)		
	top2.w.keep6.EMA10 = bt.run(data, type='share', trade.summary=T, capital=capital)


png(filename = 'plot4.png', width = 800, height = 600, units = 'px', pointsize = 12, bg = 'white')				
	# Plot Strategy Metrics Side by Side
	plotbt.strategy.sidebyside(top2.d, top2.d.keep6, top2.d.keep6.EMA10, top2.w, top2.w.keep6, top2.w.keep6.EMA10, perfromance.fn = 'engineering.returns.kpi')
dev.off()






	#*****************************************************************
	# Possible Improvements to reduce drawdowns
	#****************************************************************** 
	# Equal Weight
	data$weight[] = ntop(prices, n)
	ew = bt.run(data)	

	# Avoiding severe draw downs
	# http://engineering-returns.com/2010/07/26/rotational-trading-system/
	# Only trade the system when the index is either above the 200 MA or 30 MA
	# Usually these severe draw downs  happen bellow the 200MA average and 
	# the second 30 MA average will help to get in when the recovery happens	
	buy.rule = (ew$equity > SMA(ew$equity,200)) | (ew$equity > SMA(ew$equity,30))
	buy.rule = (ew$equity > SMA(ew$equity,200))
		buy.rule = ifna(buy.rule, F)

	# Rank using TSI by Frank Hassler, TSI is already smoothed and slow varying, 
	# so SMA will filter will not very effective
	#http://engineering-returns.com/tsi/
	position.score = bt.apply(data, function(x) TSI(HLC(x)) )		
		position.score.ma = position.score
		position.score[!buy.rule,] = NA

}



###############################################################################
# Charting the Santa Claus Rally
# http://ibankcoin.com/woodshedderblog/2011/12/15/charting-the-santa-claus-rally/
#
# Trading Calendar
# http://www.cxoadvisory.com/trading-calendar/
###############################################################################
bt.december.trading.test <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = spl('SPY')

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1970-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)		
	bt.prep(data, align='remove.na', dates='1970::2011')

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	prices = data$prices  
	n = len(tickers)  
	ret = prices / mlag(prices) - 1


	# find prices in December
	dates = index(prices)
	years = date.year(dates)	
	index = which(date.month(dates) == 12)

	# rearrange data in trading days
	trading.days = sapply(tapply(ret[index,], years[index], function(x) coredata(x)), function(x) x[1:22])

	# average return each trading days, excluding current year
	avg.trading.days = apply(trading.days[, -ncol(trading.days)], 1, mean, na.rm=T)
	current.year = trading.days[, ncol(trading.days)]

	# cumulative
	avg.trading.days = 100 * ( cumprod(1 + avg.trading.days) - 1 )
	current.year = 100 * ( cumprod(1 + current.year) - 1 )

	#*****************************************************************
	# Create Plot
	#****************************************************************** 	
png(filename = 'plot1.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')	
	# plot	
	par(mar=c(4,4,1,1))
	plot(avg.trading.days, type='b', col=1,
		ylim=range(avg.trading.days,current.year,na.rm=T),
		xlab = 'Number of Trading Days in December',
		ylab = 'Avg % Profit/Loss'
		)
		lines(current.year, type='b', col=2)
	grid()
	plota.legend('Avg SPY,SPY Dec 2011', 1:2)
dev.off()	

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 	
	# Buy & Hold	
	data$weight[] = 1
		capital = 100000
		data$weight[] = (capital / prices) * data$weight
	buy.hold = bt.run(data, type='share', capital=capital)


	# Find Last trading days in November and December
	index = which(date.month(dates) == 11)
	last.day.november = match(tapply(dates[index], years[index], function(x) tail(x,1)), dates)
	index = which(date.month(dates) == 12)
	last.day.december = match(tapply(dates[index], years[index], function(x) tail(x,1)), dates)

	# December
	data$weight[] = NA	
		data$weight[last.day.november,] = 1
		data$weight[last.day.december,] = 0
		capital = 100000
		data$weight[] = (capital / prices) * data$weight
	december = bt.run(data, type='share', capital=capital, trade.summary=T)

	#*****************************************************************
	# Create Report
	#****************************************************************** 
png(filename = 'plot2.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')
	plotbt.custom.report.part1(december, buy.hold, trade.summary=T)	
dev.off()	

png(filename = 'plot3.png', width = 1200, height = 800, units = 'px', pointsize = 12, bg = 'white')	
	plotbt.custom.report.part2(december, buy.hold, trade.summary=T)	
dev.off()	

}


###############################################################################
# Seasonality Case Study
# Historical Seasonality Analysis: What company in DOW is likely to do well in January? 
###############################################################################
bt.seasonality.test <- function() 
{	
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')		
	tickers = dow.jones.components()

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1970-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)	
	bt.prep(data, align='keep.all', dates='1970::2011')

	#*****************************************************************
	# Compute monthly returns
	#****************************************************************** 
	prices = data$prices   
	n = ncol(prices)	

	# find month ends
	month.ends = endpoints(prices, 'months')

	prices = prices[month.ends,]
	ret = prices / mlag(prices) - 1

	# keep only January	
	ret = ret[date.month(index(ret)) == 1, ]

	# keep last 20 years
	ret = last(ret,20)

	#*****************************************************************
	# Compute stats
	#****************************************************************** 
	stats = matrix(rep(NA,2*n), nc=n)
		colnames(stats) = colnames(prices)
		rownames(stats) = spl('N,Positive')

	for(i in 1:n) {
		stats['N',i] = sum(!is.na(ret[,i]))
		stats['Positive',i] = sum(ret[,i]>0, na.rm=T)	
	}
	sort(stats['Positive',], decreasing =T)

png(filename = 'plot1.png', width = 600, height = 200, units = 'px', pointsize = 12, bg = 'white')										
	plot.table(stats[, order(stats['Positive',], decreasing =T)[1:10]])
dev.off()	



}


###############################################################################
# Volatility Forecasting using Garch(1,1) based
#
# Regime Switching System Using Volatility Forecast by Quantum Financier
# http://quantumfinancier.wordpress.com/2010/08/27/regime-switching-system-using-volatility-forecast/
###############################################################################
# Benchmarking Garch algorithms 
# garch from tseries package is faster than garchFit from fGarch package
###############################################################################
bt.test.garch.speed <- function() 
{
	load.packages('tseries,fGarch,rbenchmark')	

	temp = garchSim(n=252)

	test1 <- function() {
		fit1=garch(temp, order = c(1, 1), control = garch.control(trace = F))
	}
	test2 <- function() {
		fit2=garchFit(~ garch(1,1), data = temp, include.mean=FALSE, trace=F)
	}

	benchmark(
		test1(),
		test2(),
		columns=spl('test,replications,elapsed,relative'),
		order='relative',
		replications=100
	)
}

###############################################################################
# One day ahead forecast functions for garch (tseries) and garchFit(fGarch)
# Sigma[t]^2 = w + a* Sigma[t-1]^2 + b*r[t-1]^2
# r.last - last return, h.last - last volatility
###############################################################################
garch.predict.one.day <- function(fit, r.last) 
{
	h.last = tail( fitted(fit)[,1] ,1)			
	sqrt(sum( coef(fit) * c(1,  r.last^2, h.last^2) ))	
}

# same as predict( fit, n.ahead=1, doplot=F)[3]
garchFit.predict.one.day <- function(fit, r.last) 
{
	h.last = tail(sqrt(fit@h.t), 1)
	sqrt(sum( fit@fit$matcoef[,1] * c(1,  r.last^2, h.last^2) ))
}

###############################################################################
# Forecast Volatility using Garch
# garch from tseries is fast, but does not consistently converge
# garchFit from fGarch is slower, but converges consistently
###############################################################################
bt.forecast.garch.volatility <- function(ret.log, est.period = 252) 
{		
	nperiods = nrow(ret.log)		
	garch.vol = NA * ret.log

	for( i in (est.period + 1) : nperiods ) {
		temp = as.vector(ret.log[ (i - est.period + 1) : i, ])
		r.last =  tail( temp, 1 )

		fit = tryCatch( garch(temp, order = c(1, 1), control = garch.control(trace = F)),
	    				error=function( err ) FALSE, warning=function( warn ) FALSE )

		if( !is.logical( fit ) ) {
			if( i == est.period + 1 ) garch.vol[1:est.period] = fitted(fit)[,1]
			garch.vol[i] = garch.predict.one.day(fit, r.last)
		} else {
			fit = tryCatch( garchFit(~ garch(1,1), data = temp, include.mean=FALSE, trace=F),
	    				error=function( err ) FALSE, warning=function( warn ) FALSE )

			if( !is.logical( fit ) ) {
				if( i == est.period + 1 ) garch.vol[1:est.period] = sqrt(fit@h.t)
				garch.vol[i] = garchFit.predict.one.day(fit, r.last)
			} 
		}			
		if( i %% 100 == 0) cat(i, '\n')
	}
	garch.vol[] = ifna.prev(coredata(garch.vol))
	return(garch.vol)
}	

###############################################################################
# Volatility Forecasting using Garch(1,1) based
###############################################################################
bt.volatility.garch <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = 'SPY'

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1970-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)		
	bt.prep(data, align='remove.na', dates='2000::2012')

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	prices = data$prices  
	n = len(tickers)  
	nperiods = nrow(prices)

	# Buy & Hold	
	data$weight[] = 1
	buy.hold = bt.run(data)	


	# Mean-Reversion(MR) strategy - RSI2
	rsi2 = bt.apply.matrix(prices, RSI, 2)
	data$weight[] = NA
		data$weight[] = iif(rsi2 < 50, 1, -1)	
		capital = 100000
		data$weight[] = (capital / prices) * bt.exrem(data$weight)
	mr = bt.run(data, type='share', capital=capital, trade.summary=T)


	# Trend Following(TF) strategy - MA 50/200 crossover
	sma.short = bt.apply.matrix(prices, SMA, 50)
	sma.long = bt.apply.matrix(prices, SMA, 200)
	data$weight[] = NA
		data$weight[] = iif(sma.short > sma.long, 1, -1)
		capital = 100000
		data$weight[] = (capital / prices) * bt.exrem(data$weight)
	tf = bt.run(data, type='share', capital=capital, trade.summary=T)

	#*****************************************************************
	# Create Report
	#****************************************************************** 
png(filename = 'plot1.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										

	plotbt.custom.report.part1(mr, tf, buy.hold, trade.summary=T)

dev.off()		
	#*****************************************************************
	# Regime Switching  Historical
	#****************************************************************** 
	#classify current volatility by percentile using a 252 day lookback period
	#The resulting series oscillate between 0 and 1, and is smoothed using a 21 day percentrankSMA (developed by David Varadi) using a 252 day lookback period.
	#percentrank(MA(percentrank(Stdev( diff(log(close)) ,21),252),21),250)

	ret.log = bt.apply.matrix(prices, ROC, type='continuous')
	hist.vol = bt.apply.matrix(ret.log, runSD, n = 21)
	vol.rank = percent.rank(SMA(percent.rank(hist.vol, 252), 21), 250)

	# Regime Switching  Historical
	data$weight[] = NA
		data$weight[] = iif(vol.rank > 0.5, 
							iif(rsi2 < 50, 1, -1),
							iif(sma.short > sma.long, 1, -1)
						)
		capital = 100000
		data$weight[] = (capital / prices) * bt.exrem(data$weight)
	regime.switching = bt.run(data, type='share', capital=capital, trade.summary=T)

	#*****************************************************************
	# Create Report
	#****************************************************************** 
png(filename = 'plot2.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										

	plotbt.custom.report.part1(regime.switching, mr, tf, buy.hold, trade.summary=T)

dev.off()		

	#*****************************************************************
	# Regime Switching using Garch
	#****************************************************************** 		
	load.packages('tseries,fGarch')	
	garch.vol = bt.forecast.garch.volatility(ret.log, 252)	
	vol.rank = percent.rank(SMA(percent.rank(garch.vol, 252), 21), 250)

	# Regime Switching Garch
	data$weight[] = NA
		data$weight[] = iif(vol.rank > 0.5, 
							iif(rsi2 < 50, 1, -1),
							iif(sma.short > sma.long, 1, -1)
						)
		capital = 100000
		data$weight[] = (capital / prices) * bt.exrem(data$weight)
	regime.switching.garch = bt.run(data, type='share', capital=capital, trade.summary=T)

	#*****************************************************************
	# Create Report
	#****************************************************************** 
png(filename = 'plot3.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										

	plotbt.custom.report.part1(regime.switching.garch, regime.switching, buy.hold, trade.summary=T)

dev.off()	
}





###############################################################################
# Time Series Matching
#
# Based on Jean-Robert Avettand-Fenoel - How to Accelerate Model Deployment using Rook
# http://www.londonr.org/Sep%2011%20LondonR_AvettandJR.pdf
###############################################################################
bt.matching.test <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = 'SPY'

	data = getSymbols(tickers, src = 'yahoo', from = '1950-01-01', auto.assign = F)

	#*****************************************************************
	# New: logic moved to functions
	#****************************************************************** 

png(filename = 'plot1.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')
	obj = bt.matching.find(Cl(data), plot=T)
dev.off()

png(filename = 'plot2.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')	
	matches = bt.matching.overlay(obj, plot=T)
dev.off()

png(filename = 'plot3.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')		
	bt.matching.overlay.table(obj, matches, plot=T)
dev.off()	


	#*****************************************************************
	# Original logic: Setup search
	#****************************************************************** 
	data = last(data, 252*10)
	reference = coredata(Cl(data))
		n = len(reference)
		query = reference[(n-90+1):n]	
		reference = reference[1:(n-90)]

		n.query = len(query)
		n.reference = len(reference)

	#*****************************************************************
	# Compute Distance
	#****************************************************************** 		
	dist = rep(NA, n.reference)
	query.normalized = (query - mean(query)) / sd(query)

	for( i in n.query : n.reference ) {
		window = reference[ (i - n.query + 1) : i]
		window.normalized = (window - mean(window)) / sd(window)
		dist[i] = stats:::dist(rbind(query.normalized, window.normalized))
	}

	#*****************************************************************
	# Find Matches
	#****************************************************************** 			
	min.index = c()
	n.match = 10

	# only look at the minimums 
	temp = dist
		temp[ temp > mean(dist, na.rm=T) ] = NA

	# remove n.query, points to the left/right of the minimums
	for(i in 1:n.match) {
		if(any(!is.na(temp))) {
			index = which.min(temp)
			min.index[i] = index
			temp[max(0,index - 2*n.query) : min(n.reference,(index + n.query))] = NA
		}
	}
	n.match = len(min.index)

	#*****************************************************************
	# Plot Matches
	#****************************************************************** 		
	dates = index(data)[1:len(dist)]

png(filename = 'plot1.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')
	par(mar=c(2, 4, 2, 2))
	plot(dates, dist, type='l',col='gray', main='Top Matches', ylab='Euclidean Distance', xlab='')
		abline(h = mean(dist, na.rm=T), col='darkgray', lwd=2)
		points(dates[min.index], dist[min.index], pch=22, col='red', bg='red')
		text(dates[min.index], dist[min.index], 1:n.match, adj=c(1,1), col='black',xpd=TRUE)
dev.off()			

png(filename = 'plot2.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')
	plota(data, type='l', col='gray', main=tickers)
		plota.lines(last(data,90), col='blue')
		for(i in 1:n.match) {
		plota.lines(data[(min.index[i]-n.query + 1):min.index[i]], col='red')
		}
		text(index4xts(data)[min.index - n.query/2], reference[min.index - n.query/2], 1:n.match, 
			adj=c(1,-1), col='black',xpd=TRUE)
		plota.legend('Pattern,Match Number','blue,red')
dev.off()			

	#*****************************************************************
	# Overlay all Matches
	#****************************************************************** 		
	matches = matrix(NA, nr=(n.match+1), nc=3*n.query)
	temp = c(rep(NA, n.query), reference, query)
	for(i in 1:n.match) {
		matches[i,] = temp[ (min.index[i] - n.query + 1):(min.index[i] + 2*n.query) ]	
	}
	#reference[min.index] == matches[,(2*n.query)]

	matches[(n.match+1),] = temp[ (len(temp) - 2*n.query + 1):(len(temp) + n.query) ]		
	#matches[(n.match+1), (n.query+1):(2*n.query)] == query

	for(i in 1:(n.match+1)) {
		matches[i,] = matches[i,] / matches[i,n.query]
	}


	#*****************************************************************
	# Plot all Matches
	#****************************************************************** 				
	temp = 100 * ( t(matches[,-c(1:n.query)]) - 1)

png(filename = 'plot3.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')	
	par(mar=c(2, 4, 2, 2))
	matplot(temp, type='l',col='gray',lwd=2, lty='dotted', xlim=c(1,2.5*n.query),
		main = paste('Pattern Prediction with', n.match, 'neighbours'),ylab='Normalized', xlab='')
		lines(temp[,(n.match+1)], col='black',lwd=4)

	points(rep(2*n.query,n.match), temp[2*n.query,1:n.match], pch=21, lwd=2, col='gray', bg='gray')

	bt.plot.dot.label <- function(x, data, xfun, col='red') {
		for(j in 1:len(xfun)) {
			y = match.fun(xfun[[j]])(data)
			points(x, y, pch=21, lwd=4, col=col, bg=col)
			text(x, y, paste(names(xfun)[j], ':', round(y,1),'%'),
				adj=c(-0.1,0), cex = 0.8, col=col,xpd=TRUE)			
		}
	}

	bt.plot.dot.label(2*n.query, temp[2*n.query,1:n.match], 
		list(Min=min,Max=max,Median=median,'Bot 25%'=function(x) quantile(x,0.25),'Top 75%'=function(x) quantile(x,0.75)))
	bt.plot.dot.label(n.query, temp[n.query,(n.match+1)], list(Current=min))
dev.off()	

	#*****************************************************************
	# Table with predictions
	#****************************************************************** 		
	temp = matrix( double(), nr=(n.match+4), 6)
		rownames(temp) = c(1:n.match, spl('Current,Min,Average,Max'))
		colnames(temp) = spl('Start,End,Return,Week,Month,Quarter')

	# compute returns
	temp[1:(n.match+1),'Return'] = matches[,2*n.query]/ matches[,n.query]
	temp[1:(n.match+1),'Week'] = matches[,(2*n.query+5)]/ matches[,2*n.query]
	temp[1:(n.match+1),'Month'] = matches[,(2*n.query+20)]/ matches[,2*n.query]
	temp[1:(n.match+1),'Quarter'] = matches[,(2*n.query+60)]/ matches[,2*n.query]

	# compute average returns
	index = spl('Return,Week,Month,Quarter')
	temp['Min', index] = apply(temp[1:(n.match+1),index],2,min,na.rm=T)
	temp['Average', index] = apply(temp[1:(n.match+1),index],2,mean,na.rm=T)
	temp['Max', index] = apply(temp[1:(n.match+1),index],2,max,na.rm=T)

	# format
	temp[] = plota.format(100*(temp-1),1,'','%')

	# enter dates
	temp['Current', 'Start'] = format(index(last(data,90)[1]), '%d %b %Y')
	temp['Current', 'End'] = format(index(last(data,1)[1]), '%d %b %Y')
	for(i in 1:n.match) {
		temp[i, 'Start'] = format(index(data[min.index[i] - n.query + 1]), '%d %b %Y')
		temp[i, 'End'] = format(index(data[min.index[i]]), '%d %b %Y')	
	}

	# plot table
png(filename = 'plot4.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')	
	plot.table(temp, smain='Match Number')
dev.off()		

}	

###############################################################################
# Time Series Matching Backtest
#
# New weighting scheme : seight each match by its distance
###############################################################################
bt.matching.backtest.test <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = spl('SPY,^GSPC')

	data <- new.env()
	quantmod:::getSymbols(tickers, src = 'yahoo', from = '1950-01-01', env = data, auto.assign = T)
	bt.prep(data, align='keep.all')

	# compare common part [ SPY and ^GSPC match only if not adjusted for dividends]
	#temp = data$prices['1993:01:29::']
	#plot(temp[,1]/as.double(temp[1,1]) - temp[,2]/as.double(temp[1,2]), main='Diff between SPY and ^GSPC')

	# combine SPY and ^GSPC
	scale = as.double( data$prices$SPY['1993:01:29'] / data$prices$GSPC['1993:01:29'] )
	hist = c(scale * data$prices$GSPC['::1993:01:28'], data$prices$SPY['1993:01:29::'])

	#*****************************************************************
	# Backtest setup:
	# Starting January 1994, each month search for the 10 best matches 
	# similar to the last 90 days in the last 10 years of history data
	#
	# Invest next month if distance weighted prediction is positive
	# otherwise stay in cash
	#****************************************************************** 
	# find month ends
	month.ends = endpoints(hist, 'months')
		month.ends = month.ends[month.ends > 0]		

	start.index = which(date.year(index(hist[month.ends])) == 1994)[1]
	weight = hist * NA

	for( i in start.index : len(month.ends) ) {
		#obj = bt.matching.find(hist[1:month.ends[i],], n.match=10, normalize.fn = normalize.mean, plot=T)
		#matches = bt.matching.overlay(obj, future=hist[(month.ends[i]+1):(month.ends[i]+22),], plot=T)
		#bt.matching.overlay.table(obj, matches, weights=NA, plot=T)

		obj = bt.matching.find(hist[1:month.ends[i],], normalize.fn = normalize.first)
		matches = bt.matching.overlay(obj)

		# compute prediction for next month
		n.match = len(obj$min.index)
		n.query = len(obj$query)				
		month.ahead.forecast = matches[,(2*n.query+22)]/ matches[,2*n.query] - 1

		# Average, mean(month.ahead.forecast[1:n.match]) 
		weights = rep(1/n.match, n.match)
		avg.direction = weighted.mean(month.ahead.forecast[1:n.match], w=weights)

		# Distance weighted average
		temp = round(100*(obj$dist / obj$dist[1] - 1))		
			n.weight = max(temp) + 1
			weights = (n.weight - temp) / ( n.weight * (n.weight+1) / 2)
		weights = weights / sum(weights)
			# barplot(weights)
		avg.direction = weighted.mean(month.ahead.forecast[1:n.match], w=weights)

		# Logic
		weight[month.ends[i]] = 0
		if( avg.direction > 0 ) weight[month.ends[i]] = 1

		# print progress		
		if( i %% 10 == 0) cat(i, '\n')
	}

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	tickers = 'SPY'
	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1950-01-01', env = data, auto.assign = T)
	bt.prep(data, align='keep.all')

	prices = data$prices  

	# Buy & Hold	
	data$weight[] = 1
	buy.hold = bt.run(data)	

	# Strategy
	data$weight[] = NA
		data$weight[] = weight['1993:01:29::']
		capital = 100000
		data$weight[] = (capital / prices) * bt.exrem(data$weight)
	test = bt.run(data, type='share', capital=capital, trade.summary=T)

	#*****************************************************************
	# Create Report
	#****************************************************************** 
png(filename = 'plot1.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										

	plotbt.custom.report.part1(test, buy.hold, trade.summary=T)

dev.off()		



}



###############################################################################
# Time Series Matching helper functions
###############################################################################
# functions to normalize data
###############################################################################
normalize.mean <- function(x) { x - mean(x) }
normalize.mean.sd <- function(x) { (x - mean(x)) / sd(x) }
normalize.first <- function(x) { x/as.double(x[1]) }

###############################################################################
# functions to compute distance
###############################################################################
dist.euclidean <- function(x) { stats:::dist(x) }

###############################################################################
# Find historical matches similar to the given query(pattern)
###############################################################################
bt.matching.find <- function
(
	data,				# time series
	n.query=90, 		# length of pattern i.e. last 90 days
	n.reference=252*10, # length of history to look for pattern
	n.match=10, 		# number of matches to find
	normalize.fn = normalize.mean.sd, 	# function to normalize data
	dist.fn = dist.euclidean,	# function to compute distance
	plot=FALSE,			# flag to create plot
	plot.dist=FALSE,	# flag to create distance plot	
	layout = NULL,		# flag to idicate if layout is already set	
	main = NULL			# plot title
)
{
	#*****************************************************************
	# Setup search
	#****************************************************************** 
	data = last(data, n.reference)
	reference = coredata(data)
		n = len(reference)
		query = reference[(n - n.query + 1):n]	
		reference = reference[1:(n - n.query)]

		main = paste(main, join(format(range(index(data)[(n - n.query + 1):n]), '%d%b%Y'), ' - '))

		n.query = len(query)
		n.reference = len(reference)

		dist.fn.name = ''
		if(is.character(dist.fn)) {
			dist.fn.name = paste('with',dist.fn)
			dist.fn = get(dist.fn)					
		}

	#*****************************************************************
	# Compute Distance
	#****************************************************************** 		
	dist = rep(NA, n.reference)
	query.normalized = match.fun(normalize.fn)(query)	

	for( i in n.query : n.reference ) {
		window = reference[ (i - n.query + 1) : i]
		window.normalized = match.fun(normalize.fn)(window)	
		dist[i] = match.fun(dist.fn)(rbind(query.normalized, window.normalized))

		# print progress		
		if( i %% 100 == 0) cat(i, '\n')
	}

	#*****************************************************************
	# Find Matches
	#****************************************************************** 			
	min.index = c()

	# only look at the minimums 
	temp = dist
		temp[ temp > mean(dist, na.rm=T) ] = NA

	# remove n.query, points to the left/right of the minimums
	for(i in 1:n.match) {
		if(any(!is.na(temp))) {
			index = which.min(temp)
			min.index[i] = index
			temp[max(0,index - 2*n.query) : min(n.reference,(index + n.query))] = NA
		}
	}
	n.match = len(min.index)


	#*****************************************************************
	# Plot Matches
	#****************************************************************** 		
	if(plot) {	
		dates = index(data)[1:len(dist)]

		if(is.null(layout)) {
			if(plot.dist) layout(1:2) else layout(1)		
		}
		par(mar=c(2, 4, 2, 2))

		if(plot.dist) {
		plot(dates, dist, type='l',col='gray', main=paste('Top Historical Matches for', main, dist.fn.name), ylab='Distance', xlab='')
			abline(h = mean(dist, na.rm=T), col='darkgray', lwd=2)
			points(dates[min.index], dist[min.index], pch=22, col='red', bg='red')
			text(dates[min.index], dist[min.index], 1:n.match, adj=c(1,1), col='black',xpd=TRUE)
		}

		plota(data, type='l', col='gray', LeftMargin = 1,
			main=iif(!plot.dist, paste('Top Historical Matches for', main), NULL)
			)
			plota.lines(last(data,90), col='blue')
			for(i in 1:n.match) {
			plota.lines(data[(min.index[i]-n.query + 1):min.index[i]], col='red')
			}
			text(index4xts(data)[min.index - n.query/2], reference[min.index - n.query/2], 1:n.match, 
				adj=c(1,-1), col='black',xpd=TRUE)
			plota.legend(paste('Pattern: ', main, ',Match Number'),'blue,red')	
	}

	return(list(min.index=min.index, dist=dist[min.index], query=query, reference=reference, dates = index(data), main = main))
}


###############################################################################
# Create matrix that overlays all matches one on top of each other
###############################################################################
# helper function to plot dots and labels
###############################################################################
bt.plot.dot.label <- function(x, data, xfun, col='red') {
	for(j in 1:len(xfun)) {
		y = match.fun(xfun[[j]])(data)
		points(x, y, pch=21, lwd=4, col=col, bg=col)
		text(x, y, paste(names(xfun)[j], ':', round(y,1),'%'),
			adj=c(-0.1,0), cex = 0.8, col=col,xpd=TRUE)			
	}
}

bt.matching.overlay <- function
(
	obj, 				# object from bt.matching.find function
	future=NA,			# time series of future, only used for plotting
 	plot=FALSE,			# flag to create plot
 	plot.index=NA,		# range of data to plot
	layout = NULL		# flag to idicate if layout is already set	
)
{
	min.index = obj$min.index
	query = obj$query
	reference = obj$reference

	n.match = len(min.index)
	n.query = len(query)
	n.reference = len(reference)

	#*****************************************************************
	# Overlay all Matches
	#****************************************************************** 		
	matches = matrix(NA, nr=(n.match+1), nc=3*n.query)
	temp = c(rep(NA, n.query), reference, query, future)
	for(i in 1:n.match) {
		matches[i,] = temp[ (min.index[i] - n.query + 1):(min.index[i] + 2*n.query) ]	
	}
	#reference[min.index] == matches[,(2*n.query)]

	matches[(n.match+1),] = temp[ (n.reference + 1):(n.reference + 3*n.query) ]		
	#matches[(n.match+1), (n.query+1):(2*n.query)] == query

	for(i in 1:(n.match+1)) {
		matches[i,] = matches[i,] / iif(!is.na(matches[i,n.query]), matches[i,n.query], matches[i,(n.query+1)])
	}

	#*****************************************************************
	# Plot all Matches
	#****************************************************************** 				
	if(plot) {		
		temp = 100 * ( t(matches[,-c(1:n.query)]) - 1)
		if(!is.na(plot.index[1])) temp=temp[plot.index,]
		n = nrow(temp)

		if(is.null(layout)) layout(1)
		#par(mar=c(4, 2, 2, 2), ...)
		par(mar=c(4, 2, 2, 2))

		matplot(temp, type='n',col='gray',lwd=2, lty='dotted', xlim=c(1, n + 0.15*n),
			main = paste(obj$main,'Historical Pattern Prediction with', n.match, 'neighbours'),ylab='Normalized', xlab = 'Trading Days')

		col=adjustcolor('yellow', 0.5)
		rect(0, par('usr')[3],n.query, par('usr')[4], col=col, border=col)
		box()


		matlines(temp, col='gray',lwd=2, lty='dotted')
		lines(temp[,(n.match+1)], col='black',lwd=4)



		points(rep(n, n.match), temp[n, 1:n.match], pch=21, lwd=2, col='gray', bg='gray')

		bt.plot.dot.label(n, temp[n, 1:n.match], 
			list(Min=min,Max=max,Median=median,'Bot 25%'=function(x) quantile(x,0.25),'Top 75%'=function(x) quantile(x,0.75)))
		bt.plot.dot.label(n.query, temp[n.query,(n.match+1)], list(Current=min))	
	}

	return(matches)
}	


###############################################################################
# Create matches summary table
###############################################################################
bt.matching.overlay.table <- function
(
	obj, 				# object from bt.matching.find function
	matches, 			# matches from bt.matching.overlay function
	weights=NA, 		# weights to compute average
 	plot=FALSE,			# flag to create plot
	layout = NULL		# flag to idicate if layout is already set	
)
{
	min.index = obj$min.index
	query = obj$query
	reference = obj$reference
	dates = obj$dates

	n.match = len(min.index)
	n.query = len(query)
	n.reference = len(reference)

	if(is.na(weights)) weights = rep(1/n.match, n.match)

	#*****************************************************************
	# Table with predictions
	#****************************************************************** 		
	temp = matrix( double(), nr=(n.match + 4), 6)
		rownames(temp) = c(1:n.match, spl('Current,Min,Average,Max'))
		colnames(temp) = spl('Start,End,Return,Week,Month,Quarter')

	# compute returns
	temp[1:(n.match+1),'Return'] = matches[,2*n.query]/ matches[,n.query]
	temp[1:(n.match+1),'Week'] = matches[,(2*n.query+5)]/ matches[,2*n.query]
	temp[1:(n.match+1),'Month'] = matches[,(2*n.query+20)]/ matches[,2*n.query]
	temp[1:(n.match+1),'Quarter'] = matches[,(2*n.query+60)]/ matches[,2*n.query]

	# compute average returns
	index = spl('Return,Week,Month,Quarter')
	temp['Min', index] = apply(temp[1:(n.match+0),index],2,min,na.rm=T)
	#temp['Average', index] = apply(temp[1:(n.match+0),index],2,mean,na.rm=T)
	temp['Average', index] = apply(temp[1:(n.match+0),index],2,weighted.mean,w=weights,na.rm=T)
	temp['Max', index] = apply(temp[1:(n.match+0),index],2,max,na.rm=T)

	# format
	temp[] = plota.format(100*(temp-1),1,'','%')

	# enter dates
	temp['Current', 'Start'] = format(dates[(n.reference+1)], '%d %b %Y')
	temp['Current', 'End'] = format(dates[len(dates)], '%d %b %Y')
	for(i in 1:n.match) {
		temp[i, 'Start'] = format(dates[min.index[i] - n.query + 1], '%d %b %Y')
		temp[i, 'End'] = format(dates[min.index[i]], '%d %b %Y')	
	}

	# plot table
	if(plot) {			
		if(is.null(layout)) layout(1)
		plot.table(temp, smain='Match Number')	
	}

	return(temp)
}



###############################################################################
# Time Series Matching with Dynamic time warping
#
# Based on Jean-Robert Avettand-Fenoel - How to Accelerate Model Deployment using Rook
# http://www.londonr.org/Sep%2011%20LondonR_AvettandJR.pdf
###############################################################################
# functions to compute distance
###############################################################################
#dist.euclidean <- function(x) { stats:::dist(x) }
dist.MOdist <- function(x) { MOdist(t(x)) }
dist.DTW <- function(x) { dtw(x[1,], x[2,])$distance }


bt.matching.dtw.test <- function() 
{
	#*****************************************************************
	# Example of Dynamic time warping from dtw help
	#****************************************************************** 
	load.packages('dtw')

	# A noisy sine wave as query
	idx = seq(0,6.28,len=100)
	query = sin(idx)+runif(100)/10

	# A cosine is for reference; sin and cos are offset by 25 samples
	reference = cos(idx)

	# map one to one, typical distance
	alignment<-dtw(query, reference, keep=TRUE)
	alignment$index1 = 1:100
	alignment$index2 = 1:100

png(filename = 'plot0.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')
	plot(alignment,main='Example of 1 to 1 mapping', type='two',off=3)
dev.off()

	# map one to many, dynamic time warping
	alignment<-dtw(query, reference, keep=TRUE)

png(filename = 'plot1.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')
	plot(alignment,main='Example of 1 to many mapping (DTW)', type='two',off=3)
dev.off()

	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = 'SPY'

	data = getSymbols(tickers, src = 'yahoo', from = '1950-01-01', auto.assign = F)	

	#*****************************************************************
	# Euclidean distance	
	#****************************************************************** 

png(filename = 'plot2.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')
	obj = bt.matching.find(Cl(data), normalize.fn = normalize.mean, dist.fn = 'dist.euclidean', plot=T)
dev.off()

png(filename = 'plot3.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')
	matches = bt.matching.overlay(obj, plot.index=1:90, plot=T)
dev.off()

png(filename = 'plot4.png', width = 600, height = 800, units = 'px', pointsize = 12, bg = 'white')
	layout(1:2)
	matches = bt.matching.overlay(obj, plot=T, layout=T)
	bt.matching.overlay.table(obj, matches, plot=T, layout=T)
dev.off()

	#*****************************************************************
	# Dynamic time warping distance	
	#****************************************************************** 
	# http://en.wikipedia.org/wiki/Dynamic_time_warping
	# http://dtw.r-forge.r-project.org/
	#****************************************************************** 

png(filename = 'plot5.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')
	obj = bt.matching.find(Cl(data), normalize.fn = normalize.mean, dist.fn = 'dist.DTW', plot=T)
dev.off()

png(filename = 'plot6.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')
	matches = bt.matching.overlay(obj, plot.index=1:90, plot=T)
dev.off()


png(filename = 'plot7.png', width = 600, height = 800, units = 'px', pointsize = 12, bg = 'white')
	layout(1:2)
	matches = bt.matching.overlay(obj, plot=T, layout=T)
	bt.matching.overlay.table(obj, matches, plot=T, layout=T)
dev.off()

	#*****************************************************************
	# Dynamic time warping distance	
	#****************************************************************** 

png(filename = 'plot8.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')
	obj = bt.matching.find(Cl(data), normalize.fn = normalize.mean, dist.fn = 'dist.DTW1', plot=T)
dev.off()

png(filename = 'plot9.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')
	matches = bt.matching.overlay(obj, plot.index=1:90, plot=T)
dev.off()


png(filename = 'plot10.png', width = 600, height = 800, units = 'px', pointsize = 12, bg = 'white')
	layout(1:2)
	matches = bt.matching.overlay(obj, plot=T, layout=T)
	bt.matching.overlay.table(obj, matches, plot=T, layout=T)
dev.off()



	#*****************************************************************
	# Dynamic time warping distance	
	#****************************************************************** 

png(filename = 'plot11.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')
	obj = bt.matching.find(Cl(data), normalize.fn = normalize.mean, dist.fn = 'dist.DDTW', plot=T)
dev.off()

png(filename = 'plot12.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')
	matches = bt.matching.overlay(obj, plot.index=1:90, plot=T)
dev.off()


png(filename = 'plot13.png', width = 600, height = 800, units = 'px', pointsize = 12, bg = 'white')
	layout(1:2)
	matches = bt.matching.overlay(obj, plot=T, layout=T)
	bt.matching.overlay.table(obj, matches, plot=T, layout=T)
dev.off()



}		


###############################################################################      
# Derivative Dynamic Time Warping by Eamonn J. Keogh and Michael J. Pazzani
# http://www.cs.rutgers.edu/~mlittman/courses/statai03/DDTW-2001.pdf
# 
# page 3
# To align two sequences using DTW we construct an n-by-m matrix where the (ith, jth)
# element of the matrix contains the distance d(qi,cj) between the two points qi and cj
# (Typically the Euclidean distance is used, so d(qi,cj) = (qi - cj)2 ).
# 
# page 6
# With DDTW the distance measure d(qi,cj) is not Euclidean but rather the square of the 
# difference of the estimated derivatives of qi and cj. 
# This estimate is simply the average of the slope of the line through the point in 
# question and its left neighbor, and the slope of the line through the left neighbor and the
# right neighbor. Empirically this estimate is more robust to outliers than any estimate
# considering only two datapoints. Note the estimate is not defined for the first and last
# elements of the sequence. Instead we use the estimates of the second and next-to-last
# elements respectively.
###############################################################################
derivative.est <- function(x) {
	x = as.vector(x)
	n = len(x)
	d = (( x - mlag(x) ) + ( mlag(x,-1)- mlag(x) ) / 2) / 2
	d[1] = d[2]
	d[n] = d[(n-1)]
	d
}

dist.DDTW <- function(x) { 
	y = x
	x[1,] = derivative.est(x[1,])
	x[2,] = derivative.est(x[2,])

	alignment = dtw(x[1,], x[2,])
	stats:::dist(rbind(y[1,alignment$index1],y[2,alignment$index2]))
	#proxy::dist(y[1,alignment$index1],y[2,alignment$index2],method='Euclidean',by_rows=F)	
}	

dist.DTW1 <- function(x) { 
	alignment = dtw(x[1,], x[2,])
	stats:::dist(rbind(x[1,alignment$index1],x[2,alignment$index2]))
}


bt.ddtw.test <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = 'SPY'

	data = getSymbols(tickers, src = 'yahoo', from = '1950-01-01', auto.assign = F)	

	#*****************************************************************
	# Setup
	#****************************************************************** 
	load.packages('dtw')

	query = as.vector(coredata(last(Cl(data['2011::2011']), 60)))
	reference = as.vector(coredata(last(Cl(data['2010::2010']), 60)))	

	#*****************************************************************
	# Dynamic Time Warping 	
	#****************************************************************** 
	alignment = dtw(query, reference, keep=TRUE)

png(filename = 'plot1.ddtw.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')
	plot(alignment,main='DTW Alignment', type='two',off=20)
dev.off()


	#*****************************************************************
	# Derivative Dynamic Time Warping by Eamonn J. Keogh and Michael J. Pazzani
	# http://www.cs.rutgers.edu/~mlittman/courses/statai03/DDTW-2001.pdf
	#****************************************************************** 
	derivative.est <- function(x) {
		x = as.vector(x)
		n = len(x)
		d = (( x - mlag(x) ) + ( mlag(x,-1)- mlag(x) ) / 2) / 2
		d[1] = d[2]
		d[n] = d[(n-1)]
		d
	}

	alignment0 = dtw(derivative.est(query), derivative.est(reference), keep=TRUE)
	alignment$index1 = alignment0$index1
	alignment$index2 = alignment0$index2

png(filename = 'plot2.ddtw.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')
	plot(alignment,main='Derivative DTW Alignment', type='two',off=20)
dev.off()


}





###############################################################################
# Position Sizing
#
# Money Management Position Sizing
# http://www.trading-plan.com/money_position_sizing.html
#
# Position Sizing is Everything
# http://www.leighdrogen.com/position-sizing-is-everything/
###############################################################################
bt.position.sizing.test <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = spl('SPY')

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1970-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)			
	bt.prep(data, align='keep.all', dates='1970::')	

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	prices = data$prices   
	nperiods = nrow(prices)

	models = list()

	#*****************************************************************
	# Buy & Hold
	#****************************************************************** 
	data$weight[] = 0
		data$weight[] = 1
	models$buy.hold = bt.run.share(data, clean.signal=T)

	#*****************************************************************
	# Volatility Position Sizing - ATR
	#****************************************************************** 
	atr = bt.apply(data, function(x) ATR(HLC(x),20)[,'atr'])

	# http://www.leighdrogen.com/position-sizing-is-everything/	
	# position size in units = ((porfolio size * % of capital to risk)/(ATR*2)) 
	data$weight[] = NA
		capital = 100000

		# risk 2% of capital, assuming 2 atr stop
		data$weight[] = (capital * 2/100) / (2 * atr)

		# make sure you are not commiting more than 100%
		# http://www.trading-plan.com/money_position_sizing.html
		max.allocation = capital / prices
		data$weight[] = iif(data$weight > max.allocation, max.allocation,data$weight)

	models$buy.hold.2atr = bt.run(data, type='share', capital=capital)					

	#*****************************************************************
	# Create Report
	#****************************************************************** 	
	models = rev(models)

png(filename = 'plot1.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										
	plotbt.custom.report.part1(models)
dev.off()	


png(filename = 'plot2.png', width = 1200, height = 800, units = 'px', pointsize = 12, bg = 'white')	
	plotbt.custom.report.part2(models)
dev.off()	


}	



###############################################################################
# Trading Equity Curve with Volatility Position Sizing
###############################################################################
bt.volatility.position.sizing.test <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = 'SPY'

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1970-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)		
	bt.prep(data, align='keep.all', dates='1994::')

	#*****************************************************************
	# Buy and Hold
	#****************************************************************** 
	models = list()
	prices = data$prices

	data$weight[] = 1
	models$buy.hold = bt.run.share(data, clean.signal=T)

	#*****************************************************************
	# Buy and Hold with target 10% Volatility
	#****************************************************************** 
	ret.log = bt.apply.matrix(prices, ROC, type='continuous')
	hist.vol = sqrt(252) * bt.apply.matrix(ret.log, runSD, n = 60)

	data$weight[] = 0.1 / hist.vol
	models$buy.hold.volatility.weighted = bt.run.share(data, clean.signal=T)

	#*****************************************************************
	# Buy and Hold with target 10% Volatility and Max Total leverage 100%
	#****************************************************************** 		
	data$weight[] = 0.1 / hist.vol
		rs = rowSums(data$weight)
		data$weight[] = data$weight / iif(rs > 1, rs, 1) 			
	models$buy.hold.volatility.weighted.100 = bt.run.share(data, clean.signal=T)

	#*****************************************************************
	# Same, rebalanced Monthly
	#****************************************************************** 
	period.ends = endpoints(prices, 'months')
		period.ends = period.ends[period.ends > 0]

	data$weight[] = NA
	data$weight[period.ends,] = 0.1 / hist.vol[period.ends,]
		rs = rowSums(data$weight[period.ends,])
		data$weight[period.ends,] = data$weight[period.ends,] / iif(rs > 1, rs, 1) 			
	models$buy.hold.volatility.weighted.100.monthly = bt.run.share(data, clean.signal=T)

	#*****************************************************************
	# Create Report
	#****************************************************************** 
png(filename = 'plot1.png', width = 800, height = 600, units = 'px', pointsize = 12, bg = 'white')										
	# Plot performance
	plotbt(models, plotX = T, log = 'y', LeftMargin = 3)	    	
		mtext('Cumulative Performance', side = 2, line = 1)
dev.off()	

png(filename = 'plot2.png', width = 1600, height = 1000, units = 'px', pointsize = 12, bg = 'white')		
	plotbt.custom.report.part2(rev(models))
dev.off()	

png(filename = 'plot3.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')		
	# Plot Portfolio Turnover for each strategy
	layout(1)
	barplot.with.labels(sapply(models, compute.turnover, data), 'Average Annual Portfolio Turnover', plotX = F, label='both')
dev.off()	



	#*****************************************************************
	# Next let's examine other volatility measures
	#****************************************************************** 
	models = models[c('buy.hold' ,'buy.hold.volatility.weighted.100.monthly')]


	# TTR volatility calc types
	calc = c("close", "garman.klass", "parkinson", "rogers.satchell", "gk.yz", "yang.zhang")

	ohlc = OHLC(data$SPY)
	for(icalc in calc) {
		vol = volatility(ohlc, calc = icalc, n = 60, N = 252)

		data$weight[] = NA
		data$weight[period.ends,] = 0.1 / vol[period.ends,]
			rs = rowSums(data$weight[period.ends,])
			data$weight[period.ends,] = data$weight[period.ends,] / iif(rs > 1, rs, 1) 			
		models[[icalc]] = bt.run.share(data, clean.signal=T)
	}

	#*****************************************************************
	# Create Report
	#****************************************************************** 
png(filename = 'plot4.png', width = 800, height = 600, units = 'px', pointsize = 12, bg = 'white')										
	# Plot performance
	plotbt(models, plotX = T, log = 'y', LeftMargin = 3)	    	
		mtext('Cumulative Performance', side = 2, line = 1)
dev.off()	

png(filename = 'plot5.png', width = 1600, height = 600, units = 'px', pointsize = 12, bg = 'white')
	plotbt.strategy.sidebyside(models)
dev.off()	


	#*****************************************************************
	# Volatility Position Sizing applied to MA cross-over strategy's Equity Curve
	#****************************************************************** 
	models = list()	

	sma.fast = SMA(prices, 50)
	sma.slow = SMA(prices, 200)
	weight = iif(sma.fast >= sma.slow, 1, -1)

	data$weight[] = weight
	models$ma.crossover = bt.run.share(data, clean.signal=T)

	#*****************************************************************
	# Target 10% Volatility
	#****************************************************************** 
	ret.log = bt.apply.matrix(models$ma.crossover$equity, ROC, type='continuous')
	hist.vol = sqrt(252) * bt.apply.matrix(ret.log, runSD, n = 60)

	data$weight[] = NA
		data$weight[period.ends,] = (0.1 / hist.vol[period.ends,]) * weight[period.ends,]
		# limit total leverage to 100%		
		rs = rowSums(data$weight[period.ends,])
		data$weight[period.ends,] = data$weight[period.ends,] / iif(abs(rs) > 1, abs(rs), 1) 			
	models$ma.crossover.volatility.weighted.100.monthly = bt.run.share(data, clean.signal=T)

	#*****************************************************************
	# Create Report
	#****************************************************************** 
png(filename = 'plot6.png', width = 800, height = 600, units = 'px', pointsize = 12, bg = 'white')										
	# Plot performance
	plotbt(models, plotX = T, log = 'y', LeftMargin = 3)	    	
		mtext('Cumulative Performance', side = 2, line = 1)
dev.off()	

png(filename = 'plot7.png', width = 1200, height = 800, units = 'px', pointsize = 12, bg = 'white')		
	plotbt.custom.report.part2(rev(models))
dev.off()	


	#*****************************************************************
	# Apply Volatility Position Sizing Timing stretegy by M. Faber
	#****************************************************************** 
	tickers = spl('SPY,QQQ,EEM,IWM,EFA,TLT,IYR,GLD')

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1970-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)		
	bt.prep(data, align='remove.na', dates='1994::')

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	prices = data$prices   
		n = ncol(prices)
	models = list()

	period.ends = endpoints(prices, 'months')
		period.ends = period.ends[period.ends > 0]

	#*****************************************************************
	# Equal Weight
	#****************************************************************** 
	data$weight[] = NA
		data$weight[period.ends,] = ntop(prices[period.ends,], n)
		data$weight[1:200,] = NA
	models$equal.weight = bt.run.share(data, clean.signal=F)

	#*****************************************************************
	# Timing by M. Faber
	#****************************************************************** 
	sma = bt.apply.matrix(prices, SMA, 200)

	weight = ntop(prices, n) * (prices > sma)
	data$weight[] = NA
		data$weight[period.ends,] = weight[period.ends,]
	models$timing = bt.run.share(data, clean.signal=F)

	#*****************************************************************
	# Timing with target 10% Volatility
	#****************************************************************** 
	ret.log = bt.apply.matrix(models$timing$equity, ROC, type='continuous')
	hist.vol = bt.apply.matrix(ret.log, runSD, n = 60)
		hist.vol = sqrt(252) * as.vector(hist.vol)

	data$weight[] = NA
		data$weight[period.ends,] = (0.1 / hist.vol[period.ends]) * weight[period.ends,]
		rs = rowSums(data$weight)
		data$weight[] = data$weight / iif(rs > 1, rs, 1) 				
		data$weight[1:200,] = NA
	models$timing.volatility.weighted.100.monthly = bt.run.share(data, clean.signal=T)


	#*****************************************************************
	# Create Report
	#****************************************************************** 
png(filename = 'plot8.png', width = 800, height = 600, units = 'px', pointsize = 12, bg = 'white')										
	# Plot performance
	plotbt(models, plotX = T, log = 'y', LeftMargin = 3)	    	
		mtext('Cumulative Performance', side = 2, line = 1)
dev.off()	

png(filename = 'plot9.png', width = 1200, height = 800, units = 'px', pointsize = 12, bg = 'white')		
	plotbt.custom.report.part2(rev(models))
dev.off()	


}	





###############################################################################
# Rolling Correlation
# http://www.activetradermag.com/index.php/c/Trading_Strategies/d/Trading_correlation
###############################################################################
bt.rolling.cor.test <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = sp500.components()$tickers

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1970-01-01', env = data, auto.assign = T)
		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)		
	bt.prep(data, align='keep.all', dates='1970::')

	spy = getSymbols('SPY', src = 'yahoo', from = '1970-01-01', auto.assign = F)
		ret.spy = coredata( Cl(spy) / mlag(Cl(spy))-1 )

	#*****************************************************************
	# Code Logic
	#****************************************************************** 
	prices = data$prices['1993:01:29::']  
		nperiods = nrow(prices)

	ret = prices / mlag(prices) - 1
		ret = coredata(ret)

	# require at least 100 stocks with prices
	index = which((count(t(prices)) > 100 ))
		index = index[-c(1:252)]

	# average correlation among S&P 500 components
	avg.cor = NA * prices[,1]

	# average correlation between the S&P 500 index (SPX) and its component stocks
	avg.cor.spy = NA * prices[,1]

	for(i in index) {
		hist = ret[ (i- 252 +1):i, ]
		hist = hist[ , count(hist)==252, drop=F]
			nleft = ncol(hist)

		correlation = cor(hist, use='complete.obs',method='pearson')
		avg.cor[i,] = (sum(correlation) - nleft) / (nleft*(nleft-1))

		avg.cor.spy[i,] = sum(cor(ret.spy[ (i- 252 +1):i, ], hist, use='complete.obs',method='pearson')) / nleft

		if( i %% 100 == 0) cat(i, 'out of', nperiods, '\n')
	}

	#*****************************************************************
	# Create Report
	#****************************************************************** 				
png(filename = 'plot.sp500.cor.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')										


 	sma50 = SMA(Cl(spy), 50)
 	sma200 = SMA(Cl(spy), 200)
 	
 	cols = col.add.alpha(spl('green,red'),50)
	plota.control$col.x.highlight = iif(sma50 > sma200, cols[1], cols[2])
	highlight = sma50 > sma200 | sma50 < sma200

	plota(avg.cor, type='l', ylim=range(avg.cor, avg.cor.spy, na.rm=T), x.highlight = highlight,
			main='Average 252 day Pairwise Correlation for stocks in SP500')
		plota.lines(avg.cor.spy, type='l', col='blue')
		plota.legend('Pairwise Correlation,Correlation with SPY,SPY 50-day SMA > 200-day SMA,SPY 50-day SMA < 200-day SMA', 
		c('black,blue',cols))

dev.off()	

}



###############################################################################
# Volatility Quantiles
###############################################################################
bt.volatility.quantiles.test <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = sp500.components()$tickers

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1970-01-01', env = data, auto.assign = T)
		#save(data, file='data.sp500.components.Rdata') 
		#load(file='data.sp500.components.Rdata') 	

		# remove companies with less than 5 years of data
		rm.index = which( sapply(ls(data), function(x) nrow(data[[x]])) < 1000 )	
		rm(list=names(rm.index), envir=data)

		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)		
	bt.prep(data, align='keep.all', dates='1994::')



	data.spy <- new.env()
	getSymbols('SPY', src = 'yahoo', from = '1970-01-01', env = data.spy, auto.assign = T)
	bt.prep(data.spy, align='keep.all', dates='1994::')

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	# setdiff(index(data.spy$prices), index(data$prices))
	# setdiff(index(data$prices),index(data.spy$prices))
	prices = data$prices
		nperiods = nrow(prices)
		n = ncol(prices)

	models = list()

	# SPY
	data.spy$weight[] = NA
		data.spy$weight[] = 1
	models$spy = bt.run(data.spy)

	# Equal Weight
	data$weight[] = NA
		data$weight[] = ntop(prices, 500)
	models$equal.weight = bt.run(data)

	#*****************************************************************
	# Create Quantiles based on the historical one year volatility 
	#****************************************************************** 
	# setup re-balancing periods
#	period.ends = 1:nperiods
	period.ends = endpoints(prices, 'weeks')
#	period.ends = endpoints(prices, 'months')
		period.ends = period.ends[period.ends > 0]

	# compute historical one year volatility	
	p = bt.apply.matrix(coredata(prices), ifna.prev)	
	ret = p / mlag(p) - 1		
	sd252 = bt.apply.matrix(ret, runSD, 252)		

	# split stocks in the S&amp;P 500 into Quantiles using one year historical Volatility	
	n.quantiles=5
	start.t = which(period.ends >= (252+2))[1]
	quantiles = weights = p * NA			

	for( t in start.t:len(period.ends) ) {
		i = period.ends[t]

		factor = sd252[i,]
		ranking = ceiling(n.quantiles * rank(factor, na.last = 'keep','first') / count(factor))

		quantiles[i,] = ranking
		weights[i,] = 1/tapply(rep(1,n), ranking, sum)[ranking]			
	}

	quantiles = ifna(quantiles,0)

	#*****************************************************************
	# Create backtest for each Quintile
	#****************************************************************** 
	for( i in 1:n.quantiles) {
		temp = weights * NA
		temp[period.ends,] = 0
		temp[quantiles == i] = weights[quantiles == i]

		data$weight[] = NA
			data$weight[] = temp
		models[[ paste('Q',i,sep='_') ]] = bt.run(data, silent = T)
	}
	rowSums(models$Q_2$weight,na.rm=T)	

	#*****************************************************************
	# Create Report
	#****************************************************************** 					
	# put all reports into one pdf file
	#pdf(file = 'report.pdf', width=8.5, height=11)

	png(filename = 'plot1.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')		
		plotbt.custom.report.part1(models)		
	dev.off()		

	png(filename = 'plot2.png', width = 600, height = 500, units = 'px', pointsize = 12, bg = 'white')		
		plotbt.strategy.sidebyside(models)
	dev.off()		




	# save summary
	#load.packages('abind')
	#out = abind(lapply(models, function(m) m$equity))	
	#	colnames(out) = names(models)
	#write.xts(make.xts(out, index(prices)), 'report.csv')	
}





###############################################################################
# Factor Attribution & Value Quantiles
###############################################################################
bt.fa.value.quantiles.test <- function() 
{
	#*****************************************************************
	# Load historical data
	#****************************************************************** 
	load.packages('quantmod')	
	tickers = sp500.components()$tickers
	#tickers = dow.jones.components()

	data <- new.env()
	getSymbols(tickers, src = 'yahoo', from = '1970-01-01', env = data, auto.assign = T)
		#save(data, file='data.sp500.components.Rdata') 
		#load(file='data.sp500.components.Rdata') 	

		# remove companies with less than 5 years of data
		rm.index = which( sapply(ls(data), function(x) nrow(data[[x]])) < 1000 )	
		rm(list=names(rm.index), envir=data)

		for(i in ls(data)) data[[i]] = adjustOHLC(data[[i]], use.Adjusted=T)		
	bt.prep(data, align='keep.all', dates='1994::')
		tickers = data$symbolnames


	data.spy <- new.env()
	getSymbols('SPY', src = 'yahoo', from = '1970-01-01', env = data.spy, auto.assign = T)
	bt.prep(data.spy, align='keep.all', dates='1994::')

	#*****************************************************************
	# Code Strategies
	#****************************************************************** 
	# setdiff(index(data.spy$prices), index(data$prices))
	# setdiff(index(data$prices),index(data.spy$prices))
	prices = data$prices
		nperiods = nrow(prices)
		n = ncol(prices)

	models = list()

	# SPY
	data.spy$weight[] = NA
		data.spy$weight[] = 1
	models$spy = bt.run(data.spy)

	# Equal Weight
	data$weight[] = NA
		data$weight[] = ntop(prices, n)
	models$equal.weight = bt.run(data)

	#*****************************************************************
	# Compute Factor Attribution for each ticker
	#****************************************************************** 
	periodicity = 'weeks'

	# load Fama/French factors
	factors = get.fama.french.data('F-F_Research_Data_Factors', periodicity = periodicity,download = F, clean = F)

	period.ends = endpoints(data$prices, periodicity)
		period.ends = period.ends[period.ends > 0]

	# add factors and align
	data.fa <- new.env()
		for(i in tickers) data.fa[[i]] = data[[i]][period.ends,]
	data.fa$factors = factors$data / 100
	bt.prep(data.fa, align='remove.na')


	index = match( index(data.fa$prices), index(data$prices) )
	measure = data$prices[ index, ]

	for(i in tickers) {
		cat(i, '\n')

		# Facto Loadings Regression
		obj = factor.rolling.regression(data.fa, i, 36, silent=T)

		measure[,i] = coredata(obj$fl$estimate$HML)
	}


	#*****************************************************************
	# Create Value Quantiles
	#****************************************************************** 
	n.quantiles=5
	start.t = 1+36
	quantiles = weights = coredata(measure) * NA			

	for( t in start.t:nrow(weights) ) {
		factor = as.vector(coredata(measure[t,]))
		ranking = ceiling(n.quantiles * rank(factor, na.last = 'keep','first') / count(factor))
		#tapply(factor,ranking,sum)

		quantiles[t,] = ranking
		weights[t,] = 1/tapply(rep(1,n), ranking, sum)[ranking]			
	}

	quantiles = ifna(quantiles,0)

	#*****************************************************************
	# Create backtest for each Quintile
	#****************************************************************** 
	for( i in 1:n.quantiles) {
		temp = weights * NA
			temp[] = 0
		temp[quantiles == i] = weights[quantiles == i]

		data$weight[] = NA
			data$weight[index,] = temp
		models[[ paste('Q',i,sep='_') ]] = bt.run(data, silent = T)
	}

	#*****************************************************************
	# Create Report
	#****************************************************************** 					
	# put all reports into one pdf file
	#pdf(file = 'report.pdf', width=8.5, height=11)

	png(filename = 'plot1.png', width = 600, height = 600, units = 'px', pointsize = 12, bg = 'white')		
		plotbt.custom.report.part1(models)		
	dev.off()		

	png(filename = 'plot2.png', width = 600, height = 600, units = 'px', pointsize = 12, bg = 'white')		
		plotbt.strategy.sidebyside(models)
	dev.off()	

}


###############################################################################
# Three Factor Rolling Regression Viewer
# http://mas.xtreemhost.com/
############################################################################### 
# New fund regression calculator
# http://www.bogleheads.org/forum/viewtopic.php?t=11506&amp;highlight=regression
#
# Factor loadings?
# http://www.bogleheads.org/forum/viewtopic.php?t=14629
#
# Efficient Frontier: Rolling Your Own: Three-Factor Analysis
# http://www.efficientfrontier.com/ef/101/roll101.htm
#
# Kenneth R French: Data Library
# http://mba.tuck.dartmouth.edu/pages/faculty/ken.french/data_library.html
############################################################################### 
# alpha: how much 'extra' return did the fund have that could not be accounted for by the model. this is almost never large or statistically significant.
# B(MKT) = market factor: most 100% stock funds have a market factor near 1.0. higher values may indicate leverage. lower values may indicate cash and or bonds.
# B(SMB) = size factor (small minus big): positive values indicate the fund's average holding is smaller than the market
# B(HML) = value factor (high minus low): positive values indicate the fund's average holding is more 'value' oriented than the market (based on book to market ratio)
# R2: measures how well the fund returns match the model (values close to 1.0 indicate a good statistical fit)
############################################################################### 
factor.rolling.regression <- function(
	data, 
	ticker = data$symbolnames[-grep('factor', data$symbolnames)], 
	window.len = 36,
	silent = F,
	custom.stats.fn = NULL
) 
{
	ticker = ticker[1]

	#*****************************************************************
	# Facto Loadings Regression over whole period
	#****************************************************************** 
	prices = data$prices
		nperiods = nrow(prices)
		dates = index(data$prices)

	# compute simple returns	
	hist.returns = ROC(prices[,ticker], type = 'discrete')	
		hist.returns = hist.returns - data$factors$RF
	yout = hist.returns
	y = coredata(yout)

	xout = data$factors[, -which(names(data$factors) == 'RF')]
	x = coredata(xout)

#	fit = summary(lm(y~x))
#		est = fit$coefficients[,'Estimate']
#		std.err = fit$coefficients[,'Std. Error']
#		r2 = fit$r.squared

	ok.index = !(is.na(y) | (rowSums(is.na(x)) > 0))
	fit = ols(cbind(1,x[ok.index,]),y[ok.index], T)
		est = fit$coefficients
		std.err = fit$seb
	 	r2 = fit$r.squared


	# Facto Loadings - fl
	fl.all = list()
		fl.all$estimate = c(est, r2)
		fl.all$std.error = c(std.err, NA)

	#*****************************************************************
	# Facto Loadings Regression over Month window
	#****************************************************************** 
    colnames = c('alpha', colnames(x), 'R2')
    
    estimate = make.xts(matrix(NA, nr = nperiods, len(colnames)), dates)
    	colnames(estimate) = colnames
    fl = list()
    	fl$estimate = estimate
    	fl$std.error = estimate
   		if( !is.null(custom.stats.fn) ) {
   			temp = match.fun(custom.stats.fn)(cbind(1,x), y, fit)
   			fl$custom = make.xts(matrix(NA, nr = nperiods, len(temp)), dates)	
   		} 	

	# main loop
	for( i in window.len:nperiods ) {
		window.index = (i - window.len + 1) : i

		if(all(!is.na(y[window.index]))) {
		xtemp = cbind(1,x[window.index,])
		ytemp = y[window.index]
		fit = ols(xtemp, ytemp, T)
			est = fit$coefficients
			std.err = fit$seb
		 	r2 = fit$r.squared		
		fl