From c8275b9733b449fc75caf56fbed5952a81db6027 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=85=B0=E4=B8=83?= <lanqi.yx@taobao.com>
Date: Tue, 14 Oct 2014 16:00:08 +0800
Subject: [PATCH] calculateStandardDeviation bugfix

---
 lib/bp.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/bp.js b/lib/bp.js
index ea62434..ee22825 100644
--- a/lib/bp.js
+++ b/lib/bp.js
@@ -64,7 +64,7 @@ bp.Statistics.calculateStandardDeviation = function(sample, mean) {
   sample.forEach(function(x) {
     deviation += Math.pow(x - mean, 2);
   });
-  deviation = deviation / (sample.length -1);
+  deviation = deviation / sample.length;
   deviation = Math.sqrt(deviation);
   return deviation;
 };