Here you can find the source of stdev(long[] vals, long average)
public static double stdev(long[] vals, long average)
//package com.java2s; /*//from w w w . j a v a2 s. c om * Copyright (c) 2007-2012 The Broad Institute, Inc. * SOFTWARE COPYRIGHT NOTICE * This software and its documentation are the copyright of the Broad Institute, Inc. All rights are reserved. * * This software is supplied without any warranty or guaranteed support whatsoever. The Broad Institute is not responsible for its use, misuse, or functionality. * * This software is licensed under the terms of the GNU Lesser General Public License (LGPL), * Version 2.1 which is available at http://www.opensource.org/licenses/lgpl-2.1.php. */ public class Main { public static double stdev(long[] vals, long average) { long sum = 0; for (Long i : vals) sum += Math.pow((i - average), 2); return Math.sqrt(sum / (vals.length - 1)); // sample } }