Example usage for org.apache.commons.math3.stat.inference TTest pairedT

Introduction

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

Prototype

public double pairedT(final double[] sample1, final double[] sample2)
        throws NullArgumentException, NoDataException, DimensionMismatchException, NumberIsTooSmallException 

Source Link

Document

Computes a paired, 2-sample t-statistic based on the data in the input arrays.

Usage

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

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

    TTest tTest = new TTest();
    Map map = new HashMap();
    Tuple tuple = new Tuple(map);
    if (value1 instanceof List) {
        List<Number> values1 = (List<Number>) value1;
        double[] samples1 = new double[values1.size()];

        for (int i = 0; i < samples1.length; i++) {
            samples1[i] = values1.get(i).doubleValue();
        }//from   w  ww .  j  a  va 2  s . c om

        if (value2 instanceof List) {
            List<Number> values2 = (List<Number>) value2;
            double[] samples2 = new double[values2.size()];

            for (int i = 0; i < samples2.length; i++) {
                samples2[i] = values2.get(i).doubleValue();
            }

            double tstat = tTest.pairedT(samples1, samples2);
            double pval = tTest.pairedTTest(samples1, samples2);
            tuple.put("t-statistic", tstat);
            tuple.put("p-value", pval);
            return tuple;
        } else {
            throw new IOException("Second parameter for pairedTtest must be a double array");
        }
    } else {
        throw new IOException("First parameter for pairedTtest must be a double array");
    }
}

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