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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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package org.apache.commons.math.stat.descriptive.moment;
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import junit.framework.Test;
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import junit.framework.TestSuite;
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import org.apache.commons.math.stat.descriptive.StorelessUnivariateStatisticAbstractTest;
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import org.apache.commons.math.stat.descriptive.UnivariateStatistic;
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* Test cases for the {@link UnivariateStatistic} class.
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* @version $Revision: 762087 $ $Date: 2009-04-05 10:20:18 -0400 (Sun, 05 Apr 2009) $
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public class SkewnessTest extends StorelessUnivariateStatisticAbstractTest{
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protected Skewness stat;
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public SkewnessTest(String name) {
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public UnivariateStatistic getUnivariateStatistic() {
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return new Skewness();
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public static Test suite() {
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TestSuite suite = new TestSuite(SkewnessTest.class);
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suite.setName("Skewness Tests");
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public double expectedValue() {
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* Make sure Double.NaN is returned iff n < 3
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public void testNaN() {
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Skewness skew = new Skewness();
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assertTrue(Double.isNaN(skew.getResult()));
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assertTrue(Double.isNaN(skew.getResult()));
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assertTrue(Double.isNaN(skew.getResult()));
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assertFalse(Double.isNaN(skew.getResult()));