Example usage for org.apache.commons.math3.stat.inference ChiSquareTest chiSquareDataSetsComparison

Introduction

In this page you can find the example usage for org.apache.commons.math3.stat.inference ChiSquareTest chiSquareDataSetsComparison.

Prototype

public double chiSquareDataSetsComparison(long[] observed1, long[] observed2)
        throws DimensionMismatchException, NotPositiveException, ZeroException 

Source Link

Document

<p>Computes a <a href="http://www.itl.nist.gov/div898/software/dataplot/refman1/auxillar/chi2samp.htm"> Chi-Square two sample test statistic</a> comparing bin frequency counts in <code>observed1</code> and <code>observed2</code>.

Usage

From source file:org.apache.solr.client.solrj.io.eval.ChiSquareDataSetEvaluator.java

@Override
public Object doWork(Object value1, Object value2) throws IOException {

    List<Number> listA = (List<Number>) value1;
    List<Number> listB = (List<Number>) value2;

    long[] sampleA = new long[listA.size()];
    long[] sampleB = new long[listB.size()];

    for (int i = 0; i < sampleA.length; i++) {
        sampleA[i] = listA.get(i).longValue();
    }/*w  w w.  j a  v  a  2 s.  c o m*/

    for (int i = 0; i < sampleB.length; i++) {
        sampleB[i] = listB.get(i).longValue();
    }

    ChiSquareTest chiSquareTest = new ChiSquareTest();
    double chiSquare = chiSquareTest.chiSquareDataSetsComparison(sampleA, sampleB);
    double p = chiSquareTest.chiSquareTestDataSetsComparison(sampleA, sampleB);

    Map<String, Number> m = new HashMap<>();
    m.put("chisquare-statistic", chiSquare);
    m.put("p-value", p);
    return new Tuple(m);

}

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