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Commons Math example source code file (PercentileTest.java)

This example Commons Math source code file (PercentileTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Math tags/keywords

expecting, expecting, illegalargumentexception, illegalargumentexception, ok, override, percentile, percentile, percentiletest, percentiletest, univariatestatistic, univariatestatisticabstracttest

The Commons Math PercentileTest.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
package org.apache.commons.math.stat.descriptive.rank;

import org.apache.commons.math.stat.descriptive.UnivariateStatistic;
import org.apache.commons.math.stat.descriptive.UnivariateStatisticAbstractTest;

/**
 * Test cases for the {@link UnivariateStatistic} class.
 * @version $Revision: 902201 $ $Date: 2010-01-22 13:18:16 -0500 (Fri, 22 Jan 2010) $
 */
public class PercentileTest extends UnivariateStatisticAbstractTest{

    protected Percentile stat;

    /**
     * @param name
     */
    public PercentileTest(String name) {
        super(name);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public UnivariateStatistic getUnivariateStatistic() {
        return new Percentile(95.0);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public double expectedValue() {
        return this.percentile95;
    }

    public void testHighPercentile(){
        double[] d = new double[]{1, 2, 3};
        Percentile p = new Percentile(75);
        assertEquals(3.0, p.evaluate(d), 1.0e-5);
    }

    public void testPercentile() {
        double[] d = new double[] {1, 3, 2, 4};
        Percentile p = new Percentile(30);
        assertEquals(1.5, p.evaluate(d), 1.0e-5);
        p.setQuantile(25);
        assertEquals(1.25, p.evaluate(d), 1.0e-5);
        p.setQuantile(75);
        assertEquals(3.75, p.evaluate(d), 1.0e-5);
        p.setQuantile(50);
        assertEquals(2.5, p.evaluate(d), 1.0e-5);

        // invalid percentiles
        try {
            p.evaluate(d, 0, d.length, -1.0);
            fail();
        } catch (IllegalArgumentException ex) {
            // success
        }
        try {
            p.evaluate(d, 0, d.length, 101.0);
            fail();
        } catch (IllegalArgumentException ex) {
            // success
        }
    }

    public void testNISTExample() {
        double[] d = new double[] {95.1772, 95.1567, 95.1937, 95.1959,
                95.1442, 95.0610,  95.1591, 95.1195, 95.1772, 95.0925, 95.1990, 95.1682
        };
        Percentile p = new Percentile(90);
        assertEquals(95.1981, p.evaluate(d), 1.0e-4);
        assertEquals(95.1990, p.evaluate(d,0,d.length, 100d), 0);
    }

    public void test5() {
        Percentile percentile = new Percentile(5);
        assertEquals(this.percentile5, percentile.evaluate(testArray), getTolerance());
    }

    public void testNullEmpty() {
        Percentile percentile = new Percentile(50);
        double[] nullArray = null;
        double[] emptyArray = new double[] {};
        try {
            percentile.evaluate(nullArray);
            fail("Expecting IllegalArgumentException for null array");
        } catch (IllegalArgumentException ex) {
            // expected
        }
        assertTrue(Double.isNaN(percentile.evaluate(emptyArray)));
    }

    public void testSingleton() {
        Percentile percentile = new Percentile(50);
        double[] singletonArray = new double[] {1d};
        assertEquals(1d, percentile.evaluate(singletonArray), 0);
        assertEquals(1d, percentile.evaluate(singletonArray, 0, 1), 0);
        assertEquals(1d, percentile.evaluate(singletonArray, 0, 1, 5), 0);
        assertEquals(1d, percentile.evaluate(singletonArray, 0, 1, 100), 0);
        assertTrue(Double.isNaN(percentile.evaluate(singletonArray, 0, 0)));
    }

    public void testSpecialValues() {
        Percentile percentile = new Percentile(50);
        double[] specialValues = new double[] {0d, 1d, 2d, 3d, 4d,  Double.NaN};
        assertEquals(2.5d, percentile.evaluate(specialValues), 0);
        specialValues =  new double[] {Double.NEGATIVE_INFINITY, 1d, 2d, 3d,
                Double.NaN, Double.POSITIVE_INFINITY};
        assertEquals(2.5d, percentile.evaluate(specialValues), 0);
        specialValues = new double[] {1d, 1d, Double.POSITIVE_INFINITY,
                Double.POSITIVE_INFINITY};
        assertTrue(Double.isInfinite(percentile.evaluate(specialValues)));
        specialValues = new double[] {1d, 1d, Double.NaN,
                Double.NaN};
        assertTrue(Double.isNaN(percentile.evaluate(specialValues)));
        specialValues = new double[] {1d, 1d, Double.NEGATIVE_INFINITY,
                Double.NEGATIVE_INFINITY};
        // Interpolation results in NEGATIVE_INFINITY + POSITIVE_INFINITY
        assertTrue(Double.isNaN(percentile.evaluate(specialValues)));
    }

    public void testSetQuantile() {
        Percentile percentile = new Percentile(10);
        percentile.setQuantile(100); // OK
        assertEquals(100, percentile.getQuantile(), 0);
        try {
            percentile.setQuantile(0);
            fail("Expecting IllegalArgumentException");
        } catch (IllegalArgumentException ex) {
            // expected
        }
        try {
            new Percentile(0);
            fail("Expecting IllegalArgumentException");
        } catch (IllegalArgumentException ex) {
            // expected
        }
    }

}

Other Commons Math examples (source code examples)

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