Example usage for org.apache.commons.math.stat.descriptive.moment StandardDeviation StandardDeviation

Introduction

In this page you can find the example usage for org.apache.commons.math.stat.descriptive.moment StandardDeviation StandardDeviation.

Prototype

public StandardDeviation(boolean isBiasCorrected)

Source Link

Document

Contructs a StandardDeviation with the specified value for the isBiasCorrected property.

Usage

From source file:jsprit.core.algorithm.termination.VariationCoefficientTermination.java

@Override
public boolean isPrematureBreak(DiscoveredSolution discoveredSolution) {
    if (discoveredSolution.isAccepted()) {
        lastAccepted = discoveredSolution.getSolution();
        solutionValues[currentIteration] = discoveredSolution.getSolution().getCost();
    } else {//from w  w  w .j a  v  a 2s  . c o m
        if (lastAccepted != null) {
            solutionValues[currentIteration] = lastAccepted.getCost();
        } else
            solutionValues[currentIteration] = Integer.MAX_VALUE;
    }
    if (currentIteration == (noIterations - 1)) {
        double mean = StatUtils.mean(solutionValues);
        double stdDev = new StandardDeviation(true).evaluate(solutionValues, mean);
        double variationCoefficient = stdDev / mean;
        if (variationCoefficient < variationCoefficientThreshold) {
            return true;
        }
    }
    return false;
}

From source file:org.beedraz.semantics_II.expression.number.real.double64.stat.DoublePopulationStandardDeviationBeed.java

/**
 * @post  getSource() == null;//from  w  w w .j ava2 s.c o  m
 * @post  getDouble() == null;
 * @post  owner != null ? owner.registerAggregateElement(this);
 */
public DoublePopulationStandardDeviationBeed(AggregateBeed owner) {
    super(new StandardDeviation(false), owner);
}

From source file:org.beedraz.semantics_II.expression.number.real.double64.stat.DoubleSampleStandardDeviationBeed.java

/**
 * @post  getSource() == null;/* ww  w .  j a  va2  s  . co  m*/
 * @post  getDouble() == null;
 * @post  owner != null ? owner.registerAggregateElement(this);
 */
public DoubleSampleStandardDeviationBeed(AggregateBeed owner) {
    super(new StandardDeviation(true), owner);
}