com.itemanalysis.psychometrics.kernel.SimplePluginBandwidthTest.java Source code

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Here is the source code for com.itemanalysis.psychometrics.kernel.SimplePluginBandwidthTest.java

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/*
 * Copyright 2012 J. Patrick Meyer
 *
 * Licensed 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 com.itemanalysis.psychometrics.kernel;

import org.apache.commons.math3.stat.descriptive.moment.StandardDeviation;
import org.junit.Test;

import static org.junit.Assert.assertEquals;

public class SimplePluginBandwidthTest {

    double[] x = { 103.36, 86.85, 96.57, 100.06, 127.03, 105.2, 109.78, 121.87, 94.71, 101.17, 93.93, 110.45, 103.3,
            88.52, 119.2, 108.45, 90.39, 118.2, 117.28, 88.95, 88.97, 105.29, 118.8, 107.22, 101.47, 95.92, 105.33,
            119.37, 98.37, 127.59, 102.69, 91.83, 90.93, 106.3, 100.18, 102.22, 103.14, 102.18, 96.12, 127.27,
            98.67, 108.68, 84.45, 89.31, 87.09, 134.82, 117.41, 93.35, 95.36, 82.95 };

    public SimplePluginBandwidthTest() {

    }

    @Test
    public void testValue() throws Exception {
        System.out.print("SimplePluginBandwidthTest: ");
        StandardDeviation sd = new StandardDeviation();
        for (int i = 0; i < x.length; i++) {
            sd.increment(x[i]);
        }
        SimplePluginBandwidth bw = new SimplePluginBandwidth(sd, 1.0);
        System.out.println(bw.value());
        assertEquals("Reference bandwidth test", 6.09603513572289, bw.value(), 1.0e-10);
    }

}