Java List std standardDeviationDouble(List list, boolean populationStandardDeviation)

Description

Standard deviation double.

License

Apache License

Parameter

Parameter	Description
list	the list
populationStandardDeviation	the population standard deviation

Return

the double

Declaration

public static double standardDeviationDouble(List<Double> list, boolean populationStandardDeviation) 

Method Source Code

//package com.java2s;
/*// w  w w .j a  v a2  s .  c o m
Copyright 2014 Array-Utilities
    
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
    
http://www.apache.org/licenses/LICENSE-2.0
    
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
    
 * */

import java.util.List;

public class Main {
    /**
     * Standard deviation double.
     *
     * @param list the list
     * @param populationStandardDeviation the population standard deviation
     * @return the double
     */
    public static double standardDeviationDouble(List<Double> list, boolean populationStandardDeviation) {

        if (populationStandardDeviation) {
            return Math.sqrt(varianceDouble(list, populationStandardDeviation));
        }
        return Math.sqrt(varianceDouble(list, populationStandardDeviation));

    }

    /**
     * Variance double.
     *
     * @param list the list
     * @param populationStandardDeviation the population standard deviation
     * @return the double
     */
    public static double varianceDouble(List<Double> list, boolean populationStandardDeviation) {

        double mean = meanDouble(list);
        double variance = 0;
        for (int i = 0; i < list.size(); i++) {
            double a = Math.pow(list.get(i) - mean, 2);
            variance += a;
        }
        if (populationStandardDeviation) {
            return variance / list.size();
        }
        return variance / (list.size() - 1);
    }

    /**
     * Mean double.
     *
     * @param list the list
     * @return the double
     */
    public static double meanDouble(List<Double> list) {

        return sumDouble(list) / list.size();
    }

    public static double sumDouble(List<Double> list) {

        double sum = 0;
        for (int i = 0; i < list.size(); i++) {
            sum += list.get(i);
        }
        return sum;
    }
}

Related

1. getStdDeviation(List numbers)
2. standardDeviation(List data)
3. standardDeviation(List values)
4. standardDeviation(List list)
5. standardDeviation(List values, double xbar)
6. std(List iNumbers)
7. std(List vector, Double avg)
8. stdDev(List nums)
9. stddev(List observations)