Statistical functions moved out to a separate module

penartur · May 5, 2012 · c07a8ae · c07a8ae
1 parent 55be73a
commit c07a8ae
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Showing 2 changed files with 67 additions and 64 deletions.
diff --git a/lib/benchmark.js b/lib/benchmark.js
@@ -5,6 +5,7 @@ var WorkingQueue = require('capisce').WorkingQueue;
 var http = require('http');
 var os = require('os');
 
+var statistics = require('./statistics');
 var dateTimer = require('./timers/datetimer');
 
 var TIMERTYPES = {
@@ -20,70 +21,6 @@ var getTimer = function (timerType) {
 	}
 }
 
-var statistics = {
-	temporalDisrepancy: function (list) {
-		var sliceLength = Math.min(list.length / 2, 8);
-		return Math.round(100 * this.trimmedMean(list.slice(-sliceLength)) / this.trimmedMean(list.slice(0, sliceLength))) / 100;
-	},
-	sort: function (list) {
-		if (!list.sorted) {
-			list.sort(function (a, b) { return (a - b); });
-			list.sorted = true;
-		}
-	},
-	median: function (list) {
-		this.sort(list);
-		if (list.length % 2 == 0) {
-			return Math.round((list[list.length / 2 - 1] + list[list.length / 2]) / 2);
-		} else {
-			return list[(list.length - 1) / 2];
-		}
-	},
-	mean: function (list) {
-		var total = 0;
-		var num = 0;
-		for (var i in list) {
-			total += list[i];
-			num++;
-		}
-		return Math.round(total / num);
-	},
-	trimmedMean: function (list) {
-		if (list.length < 4) {
-			return this.median(list);
-		}
-		this.sort(list);
-		return this.mean(list.slice(list.length / 4, 3 * list.length / 4 - 1));
-	},
-	max: function (list) {
-		return Math.max.apply(null, list);
-	},
-	all: function (list) {
-		//console.log(list);
-		var temporalDisrepancy = this.temporalDisrepancy(list);
-		var mean = this.mean(list);
-		var max = this.max(list);
-		var num = list.length;
-		this.sort(list);
-		var median = this.median(list);
-		var trimmedMean = this.trimmedMean(list);
-		var top10 = this.mean(list.slice(0, list.length / 10));
-		var bottom10 = this.mean(list.slice(-list.length / 10));
-		var result = {
-			trimmedMean: trimmedMean
-			, median: median
-			, temporalDisrepancy: temporalDisrepancy
-			, mean: mean
-			, max: max
-			, num: num
-			, top10: top10
-			, bottom10: bottom10
-		};
-		//console.log(result);
-		return result;
-	}
-};
-
 var Benchmark = function (engines, pages, options) {
 	this.engines = engines;
 	this.pages = pages;

diff --git a/lib/statistics.js b/lib/statistics.js
@@ -0,0 +1,66 @@
+"use strict";
+
+var internals = {
+	temporalDisrepancy: function (list) {
+		var sliceLength = Math.min(list.length / 2, 8);
+		return Math.round(100 * this.trimmedMean(list.slice(-sliceLength)) / this.trimmedMean(list.slice(0, sliceLength))) / 100;
+	},
+	sort: function (list) {
+		if (!list.sorted) {
+			list.sort(function (a, b) { return (a - b); });
+			list.sorted = true;
+		}
+	},
+	median: function (list) {
+		this.sort(list);
+		if (list.length % 2 == 0) {
+			return Math.round((list[list.length / 2 - 1] + list[list.length / 2]) / 2);
+		} else {
+			return list[(list.length - 1) / 2];
+		}
+	},
+	mean: function (list) {
+		var total = 0;
+		var num = 0;
+		for (var i in list) {
+			total += list[i];
+			num++;
+		}
+		return Math.round(total / num);
+	},
+	trimmedMean: function (list) {
+		if (list.length < 4) {
+			return this.median(list);
+		}
+		this.sort(list);
+		return this.mean(list.slice(list.length / 4, 3 * list.length / 4 - 1));
+	},
+	max: function (list) {
+		return Math.max.apply(null, list);
+	}
+};
+
+exports.all = function (list) {
+	var temporalDisrepancy = internals.temporalDisrepancy(list);
+	var mean = internals.mean(list);
+	var max = internals.max(list);
+	var num = list.length;
+	internals.sort(list);
+	var median = internals.median(list);
+	var trimmedMean = internals.trimmedMean(list);
+	var top10 = internals.mean(list.slice(0, list.length / 10));
+	var bottom10 = internals.mean(list.slice(-list.length / 10));
+	var result = {
+		trimmedMean: trimmedMean
+			, median: median
+			, temporalDisrepancy: temporalDisrepancy
+			, mean: mean
+			, max: max
+			, num: num
+			, top10: top10
+			, bottom10: bottom10
+	};
+	//console.log(result);
+	return result;
+};
+