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plot.likert.bar.r
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plot.likert.bar.r
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utils::globalVariables(c('value','Group','variable','low','Item','high',
'neutral','x','y','pos','ddply','.','colors','low.color',
'neutral.color.ramp','high.color','neutral.color','wrap',
'wrap.grouping','centered','include.center','legend',
'plot.percent.low','text.size','text.color','plot.percent.high',
'plot.percent.neutral','plot.percents','panel.strip.color',
'panel.arrange','legend.position'))
#' Bar Plot for Likert Items.
#'
#' Bar plot for the results of \code{\link{likert}}.
#'
#' @param l results of \code{\link{likert}}.
#' @param likert object of type likert.
#' @param group.order the order in which groups (for grouped items) or items
#' (for non-grouped items) should be plotted.
#' @param center specifies which level should be treated as the center. For example,
#' \code{center = 3} would use the third level as the center whereas
#' \code{center = 3.5} would indicate no specific level is the center but
#' <= 3 are low levels and >= 4 are high levels (i.e. used for forced choice
#' items or those without a neutral option). This also influences where the
#' color breaks from low to high.
#' @param ... passed to \code{\link{likert.options}}
#' @importFrom plyr ddply
#' @export
#' @seealso plot.likert
#' @seealso likert.heat.plot
#' @seealso likert.bar.plot
#' @seealso likert.density.plot
likert.bar.plot <- function(l,
group.order,
center = (l$nlevels-1)/2 + 1,
...) {
opts <- likert.options(...)
for(i in names(opts)) {
# TODO: Eventually references to these options should happen through the list.
assign(i, opts[[i]], environment())
}
if(center < 1.5 | center > (l$nlevels - 0.5) | center %% 0.5 != 0) {
stop(paste0('Invalid center. Values can range from 1.5 to ',
(l$nlevels - 0.5), ' in increments of 0.5'))
}
ymin <- 0
ymax <- 100
ybuffer <- 5
lowrange <- 1 : floor(center - 0.5)
highrange <- ceiling(center + 0.5) : l$nlevels
cols <- NULL
if(!is.null(colors) & length(colors) == l$nlevels) {
cols <- colors
} else {
if(!is.null(colors) & length(colors) != l$nlevels) {
warning('The length of colors must be equal the number of levels.')
}
ramp <- colorRamp(c(low.color, neutral.color.ramp))
ramp <- rgb( ramp(seq(0, 1, length=length(lowrange)+1)), maxColorValue=255)
bamp <- colorRamp(c(neutral.color.ramp, high.color))
bamp <- rgb( bamp(seq(0, 1, length=length(highrange)+1)), maxColorValue=255)
cols <- NULL
if(center %% 1 != 0) {
cols <- c(ramp[1:(length(ramp)-1)], bamp[2:length(bamp)])
# cols <- c(ramp, bamp)
} else {
cols <- c(ramp[1:(length(ramp)-1)], neutral.color, bamp[2:length(bamp)])
}
}
lsum <- summary(l, center=center)
p <- NULL
if(!is.null(l$grouping)) { ##### Grouping ##################################
item_levels <- unique(l$results$Item)
item_levels <- likert:::label_wrap_mod(item_levels, width = wrap)
lsum$Item <- likert:::label_wrap_mod(lsum$Item, width = wrap)
lsum$Item <- factor(lsum$Item, item_levels)
levels(l$results$Item) <- levels(lsum$Item)
#l$results$Item <- label_wrap_mod(l$results$Item, width=wrap)
lsum$Item <- factor(lsum$Item,item_levels)
#names(l$items) <- label_wrap_mod(names(l$items), width=wrap)
lsum$Group <- likert:::label_wrap_mod(lsum$Group, width=wrap.grouping)
results <- l$results
results <- reshape2::melt(results, id=c('Group', 'Item'))
results$variable <- factor(results$variable, ordered=TRUE)
if(TRUE | is.null(l$items)) {
results$Item <- factor(as.character(results$Item),
levels=item_levels,
ordered=TRUE)
} else {
results$Item <- factor(results$Item,
levels=label_wrap_mod(names(l$items), width=wrap),
ordered=TRUE)
}
ymin <- 0
if(centered) {
ymin <- -100
rows <- which(results$variable %in% names(l$results)[3:(length(lowrange)+2)])
results[rows,'value'] <- -1 * results[rows,'value']
if(center %% 1 == 0) { #Midpoint is a level
rows.mid <- which(results$variable %in% names(l$results)[center+2])
if(include.center) {
tmp <- results[rows.mid,]
tmp$value <- tmp$value / 2 * -1
results[rows.mid,'value'] <- results[rows.mid,'value'] / 2
results <- rbind(results, tmp)
} else {
results <- results[-rows.mid,]
}
}
results.low <- results[results$value < 0,]
results.high <- results[results$value > 0,]
# NOTE: This is to fix an issue introduced in ggplot2 version 2.2.0. As of version
# 1.3.6 ggplot2 package version of 2.2.0 or newer is required.
results.high$variable <- factor(as.character(results.high$variable),
levels = rev(levels(results.high$variable)))
p <- ggplot(results, aes(y=value, x=Group, group=variable)) +
geom_hline(yintercept=0) +
geom_bar(data=results.high, aes(fill=variable), stat='identity')
if(nrow(results.low)>0){
p <- p + geom_bar(data=results.low[nrow(results.low):1,],
aes(fill=variable), stat='identity')
}
names(cols) <- levels(results$variable)
p <- p + scale_fill_manual(legend, breaks=names(cols), values=cols, drop=FALSE)
} else {
ymin <- 0
names(cols) <- rev(names(cols))
p <- ggplot(results, aes(y=value, x=Group, group=variable))
p <- p + geom_bar(stat='identity', aes(fill=variable), position = position_stack(reverse = TRUE)) +
scale_fill_manual(legend,
values=cols,
breaks=levels(results$variable),
labels=levels(results$variable),
drop=FALSE)
}
if(plot.percent.low) {
p <- p + geom_text(data=lsum, y=ymin, aes(x=Group,
label=paste0(prettyNum(low, digits=digits, drop0trailing=drop0trailing, zero.print=zero.print), '%'),
group=Item),
size=text.size, hjust=1, color=text.color)
}
if(plot.percent.high) {
p <- p + geom_text(data=lsum, aes(x=Group, y=100,
label=paste0(prettyNum(high, digits=digits, drop0trailing=drop0trailing, zero.print=zero.print), '%'),
group=Item), size=text.size, hjust=-.2, color=text.color)
}
if(plot.percent.neutral & l$nlevels %% 2 == 1 & include.center) {
if(centered) {
p <- p + geom_text(data=lsum, y=0, aes(x=Group, group=Item,
label=paste0(prettyNum(neutral, digits=digits, drop0trailing=drop0trailing, zero.print=zero.print), '%')),
size=text.size, hjust=.5, color=text.color)
} else {
lsum$y <- lsum$low + (lsum$neutral/2)
p <- p + geom_text(data=lsum, aes(x=Group, y=y, group=Item,
label=paste0(prettyNum(neutral, digits=digits, drop0trailing=drop0trailing, zero.print=zero.print), '%')),
size=text.size, hjust=.5, color=text.color)
}
}
if(plot.percents) {
#warning('plot.percents is not currently supported for grouped analysis.')
lpercentpos <- ddply(results[results$value > 0,], .(Group, Item), transform,
pos = cumsum(value) - 0.5 * value)
p <- p + geom_text(data = lpercentpos,
aes(x = Group, y = pos,
label = paste0(prettyNum(value, digits=digits, drop0trailing=drop0trailing, zero.print=zero.print), '%'),
group = Item), size = text.size)
lpercentneg <- results[results$value < 0, ]
if(nrow(lpercentneg) > 0) {
lpercentneg <- lpercentneg[nrow(lpercentneg):1, ]
lpercentneg$value <- abs(lpercentneg$value)
lpercentneg <-
ddply(lpercentneg,
.(Group, Item),
transform,
pos = cumsum(value) - 0.5 * value)
lpercentneg$pos <- lpercentneg$pos * -1
p <- p + geom_text(data = lpercentneg,
aes(x = Group, y = pos,
label = paste0(prettyNum(abs(value), digits=digits, drop0trailing=drop0trailing, zero.print=zero.print), '%')),
size = text.size)
}
}
p <- p + coord_flip() + ylab(ylabel) + xlab('') +
theme(axis.ticks=element_blank(),
strip.background=element_rect(fill=panel.strip.color,
color=panel.strip.color))
if(is.null(panel.arrange)) {
p <- p + facet_wrap(~ Item)
} else if(panel.arrange == 'v') {
p <- p + facet_wrap(~ Item, ncol=1)
#p <- p + facet_grid(Item ~ .)
} else if(panel.arrange == 'h') {
p <- p + facet_wrap(~ Item, nrow=1)
}
if(!missing(group.order)) {
p <- p + scale_x_discrete(limits=rev(group.order), drop=FALSE)
}
} else { ##### No grouping #################################################
factor.mapping <- NULL
if(!is.null(l$factors)) {
factor.mapping <- l$results[,1:2]
names(factor.mapping)[2] <- 'Factor'
results <- reshape2::melt(l$results[,-2], id.vars='Item')
} else {
results <- reshape2::melt(l$results, id.vars='Item')
}
if(ordered & is.null(results$factor)) {
order <- lsum[order(lsum$high),'Item']
results$Item <- factor(results$Item, levels=order)
}
if(!ordered & !missing(group.order)) {
results$Item <- factor(results$Item , levels = group.order)
}
ymin <- 0
if(centered) {
ymin <- -100
rows <- which(results$variable %in% names(l$results)[
2:(length(lowrange) + 1)])
results[rows, 'value'] <- -1 * results[rows, 'value']
if(center %% 1 == 0) { # Midpoint is a level (i.e. there are an odd number of levels)
rows.mid <- which(results$variable %in% names(l$results)[center+1])
if(include.center) {
tmp <- results[rows.mid,]
tmp$value <- tmp$value/2 * -1
results[rows.mid,'value'] <- results[rows.mid,'value'] / 2
results <- rbind(results, tmp)
} else {
#results[rows.mid,'value'] <- 0
results <- results[-rows.mid,]
}
}
if(!is.null(factor.mapping)) {
results$order <- 1:nrow(results)
results <- merge(results, factor.mapping,
by='Item', all.x=TRUE)
results <- results[order(results$order),]
results$order <- NULL
}
results.low <- results[results$value < 0,]
results.high <- results[results$value > 0,]
p <- ggplot(results, aes(y=value, x=Item, group=Item)) +
geom_hline(yintercept=0) +
geom_bar(data=results.high, aes(fill=variable), stat='identity')
names(cols) <- levels(results$variable)
if(nrow(results.low) > 0) {
p <- p + geom_bar(data=results.low[nrow(results.low):1,],
aes(fill=variable), stat='identity')
}
p <- p + scale_fill_manual(legend, breaks=names(cols), values=cols, drop=FALSE)
} else {
if(!is.null(factor.mapping)) {
results$order <- 1:nrow(results)
results <- merge(results, factor.mapping,
by='Item', all.x=TRUE)
results <- results[order(results$order),]
results$order <- NULL
}
p <- ggplot(results, aes(y=value, x=Item, group=Item))
p <- p + geom_bar(stat='identity', aes(fill=variable))
p <- p + scale_fill_manual(legend, values=cols,
breaks=levels(results$variable),
labels=levels(results$variable),
drop=FALSE)
}
if(plot.percent.low) {
p <- p + geom_text(data=lsum, y=ymin, aes(x=Item,
label=paste0(prettyNum(low, digits=digits, drop0trailing=drop0trailing, zero.print=zero.print), '%')),
size=text.size, hjust=1, color=text.color)
}
if(plot.percent.high) {
p <- p + geom_text(data=lsum, y=100, aes(x=Item,
label=paste0(prettyNum(high, digits=digits, drop0trailing=drop0trailing, zero.print=zero.print), '%')),
size=text.size, hjust=-.2, color=text.color)
}
if(plot.percent.neutral & l$nlevels %% 2 == 1 & include.center & !plot.percents) {
if(centered) {
p <- p +
geom_text(data=lsum, y=0,
aes(x=Item,
label=paste0(prettyNum(neutral, digits=digits, drop0trailing=drop0trailing, zero.print=zero.print), '%')),
size=text.size, hjust=.5, color=text.color)
} else {
lsum$y <- lsum$low + (lsum$neutral/2)
p <- p +
geom_text(data=lsum,
aes(x=Item, y=y,
label=paste0(prettyNum(neutral, digits=digits, drop0trailing=drop0trailing, zero.print=zero.print), '%')),
size=text.size, hjust=.5, color=text.color)
}
}
if(plot.percents) {
center.label <- ''
if(center %% 1 == 0) { # Midpoint is a level (i.e. there are an odd number of levels)
center.label <- names(l$results)[center+1]
}
lpercentpos <- ddply(results[results$value > 0,], .(Item), transform,
pos = cumsum(value) - 0.5*value)
p <- p + geom_text(data=lpercentpos[lpercentpos$variable != center.label,],
aes(x=Item, y=pos,
label=paste0(prettyNum(value, digits=digits, drop0trailing=drop0trailing, zero.print=zero.print), '%')),
size=text.size, color=text.color)
lpercentneg <- results[results$value < 0,]
if(nrow(lpercentneg) > 0) {
lpercentneg <- lpercentneg[nrow(lpercentneg):1,]
lpercentneg$value <- abs(lpercentneg$value)
lpercentneg <- ddply(lpercentneg, .(Item), transform,
pos = cumsum(value) - 0.5*value)
lpercentneg$pos <- lpercentneg$pos * -1
p <- p + geom_text(data=lpercentneg[lpercentneg$variable != center.label,],
aes(x=Item, y=pos,
label=paste0(prettyNum(abs(value), digits=digits, drop0trailing=drop0trailing, zero.print=zero.print), '%')),
size=text.size, color=text.color)
}
lpercentneutral <- results[results$variable == center.label,]
if(nrow(lpercentneutral) > 0 & centered) {
p <- p + geom_text(data=lpercentneutral,
aes(x=Item, y=0,
label=paste0(prettyNum(abs(value * 2), digits=digits, drop0trailing=drop0trailing, zero.print=zero.print), '%')),
size=text.size, color=text.color)
}
if(nrow(lpercentneutral) > 0 & !centered) {
p <- p + geom_text(data=lpercentpos[lpercentpos$variable == center.label,],
aes(x=Item, y=pos,
label=paste0(prettyNum(value, digits=digits, drop0trailing=drop0trailing, zero.print=zero.print), '%')),
size=text.size, color=text.color)
}
}
p <- p +
coord_flip() + ylab(ylabel) + xlab('') +
theme(axis.ticks=element_blank())
if(!is.null(factor.mapping)) {
# DOES NOT WORK! Not supported
# p + facet_wrap(~ Factor, ncol=1, scales='free')
}
if(!missing(group.order)) {
p <- p + scale_x_discrete(limits=rev(group.order),
labels=label_wrap_mod(rev(group.order), width=wrap), drop=FALSE)
} else {
p <- p + scale_x_discrete(breaks=l$results$Item,
labels=label_wrap_mod(l$results$Item, width=wrap), drop=FALSE)
}
} ##### End: No grouping
p <- p + scale_y_continuous(labels=abs_formatter,
limits=c(ymin - ybuffer, ymax + ybuffer))
p <- p + theme(legend.position=legend.position)
attr(p, 'item.order') <- levels(results$Item)
class(p) <- c('likert.bar.plot', class(p))
return(p)
}
#' Print method for \code{\link{likert.bar.plot}}. The primary purpose is to
#' suppress the "Stacking not well defined when ymin != 0" warning printed
#' by \code{ggplot2} for bar plots that have negative bars (i.e. the centered
#' plots).
#' @param x a plot from \code{\link{likert.bar.plot}}.
#' @param ... other parameters passed to ggplot2.
#' @export
#' @method print likert.bar.plot
print.likert.bar.plot <- function(x, ...) {
suppressWarnings(NextMethod(x, ...))
}