Java List std standardDeviation(List data)

Description

Calculate standard deviation of the array

License

Open Source License

Parameter

Parameter	Description
data	a parameter

Declaration

public static double standardDeviation(List<Double> data) 

Method Source Code

//package com.java2s;
/*/*from  ww w . j a v a  2s.c  om*/
* Open-Source tuning tools
*
* 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 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

import java.util.List;

public class Main {
    /**
     * Calculate standard deviation of the array
     * @param data
     * @return
     */
    public static double standardDeviation(List<Double> data) {
        return Math.sqrt(variance(data));
    }

    /**
     * Calculate variance of the array
     * @param data
     * @return
     */
    public static double variance(List<Double> data) {
        double mean = mean(data);
        double sum = 0;
        double diff = 0;
        for (Double d : data) {
            diff = d - mean;
            sum += (diff * diff);
        }
        return sum / data.size();
    }

    /**
     * Calculate mean of the array
     * @param data
     * @return
     */
    public static double mean(List<Double> data) {
        double val = 0;
        for (int i = 0; i < data.size(); ++i)
            val += data.get(i);
        return val / data.size();
    }
}

Related

1. calculateStandardDeviation(List doubleList)
2. getStandardDeviation(List data)
3. getStandardDeviation(List list)
4. getStandardDeviation(List values)
5. getStdDeviation(List numbers)
6. standardDeviation(List values)
7. standardDeviation(List list)
8. standardDeviation(List values, double xbar)
9. standardDeviationDouble(List list, boolean populationStandardDeviation)