Java List Mean calculateStDev(List values, double mean)

Description

calculate St Dev

License

Open Source License

Declaration

public static double calculateStDev(List<Double> values, double mean) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.List;

public class Main {
    public static double calculateStDev(List<Double> values, double mean) {

        int listSize = values.size();

        Double sumOfDiffSquared = 0.0;
        for (Double value : values) {
            double diffFromMean = value - mean;
            sumOfDiffSquared += ((diffFromMean * diffFromMean) / (listSize - 1));
            // division moved here to avoid sum becoming too big if this
            // doesn't work use incremental formulation

        }//from   w w w  .  j  a  v  a2 s.com
        double variance = sumOfDiffSquared;
        // (listSize - 1);
        // assumes at least 2 members in list.
        return Math.sqrt(variance);
    }
}

Related

1. computeMean(List fs)
2. geometricMean(List vals, double replacement)
3. getHMean(List harray)
4. getMean(List data)