Example usage for org.apache.commons.math3.stat.inference OneWayAnova anovaFValue

Introduction

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

Prototype

public double anovaFValue(final Collection<double[]> categoryData)
        throws NullArgumentException, DimensionMismatchException 

Source Link

Document

Computes the ANOVA F-value for a collection of double[] arrays.

Usage

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

@Override
public Object doWork(Object... values) throws IOException {

    // at this point we know every incoming value is an array of BigDecimals

    List<double[]> anovaInput = Arrays.stream(values)
            // for each List, convert to double[]
            .map(value -> ((List<BigDecimal>) value).stream().mapToDouble(BigDecimal::doubleValue).toArray())
            // turn into List<double[]>
            .collect(Collectors.toList());

    OneWayAnova anova = new OneWayAnova();
    double p = anova.anovaPValue(anovaInput);
    double f = anova.anovaFValue(anovaInput);
    Map<String, Number> m = new HashMap<>();
    m.put("p-value", p);
    m.put("f-ratio", f);
    return new Tuple(m);
}

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