/*
***************************************************************************************
* Copyright (C) 2006 EsperTech, Inc. All rights reserved. *
* http://www.espertech.com/esper *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
***************************************************************************************
*/
package com.espertech.esper.view.stat;
import com.espertech.esper.supportunit.util.DoubleValueAssertionUtil;
import junit.framework.TestCase;
public class TestRegressionBean extends TestCase {
private final int PRECISION_DIGITS = 6;
public void testLINEST() {
BaseStatisticsBean stat = new BaseStatisticsBean();
assertEquals(Double.NaN, stat.getSlope());
assertEquals(Double.NaN, stat.getYIntercept());
assertEquals(0, stat.getN());
stat.addPoint(1, 15);
assertEquals(Double.NaN, stat.getSlope());
assertEquals(Double.NaN, stat.getYIntercept());
assertEquals(1, stat.getN());
stat.addPoint(2, 20);
assertEquals(5d, stat.getSlope());
assertTrue(DoubleValueAssertionUtil.equals(stat.getYIntercept(), 10, PRECISION_DIGITS));
assertEquals(2, stat.getN());
stat.addPoint(1, 17);
assertTrue(DoubleValueAssertionUtil.equals(stat.getSlope(), 4, PRECISION_DIGITS));
assertTrue(DoubleValueAssertionUtil.equals(stat.getYIntercept(), 12, PRECISION_DIGITS));
assertEquals(3, stat.getN());
stat.addPoint(1.4, 14);
assertTrue(DoubleValueAssertionUtil.equals(stat.getSlope(), 3.731343284, PRECISION_DIGITS));
assertTrue(DoubleValueAssertionUtil.equals(stat.getYIntercept(), 11.46268657, PRECISION_DIGITS));
assertEquals(4, stat.getN());
stat.removePoint(1, 17);
assertTrue(DoubleValueAssertionUtil.equals(stat.getSlope(), 5.394736842, PRECISION_DIGITS));
assertTrue(DoubleValueAssertionUtil.equals(stat.getYIntercept(), 8.421052632, PRECISION_DIGITS));
assertEquals(3, stat.getN());
stat.addPoint(0, 0);
assertTrue(DoubleValueAssertionUtil.equals(stat.getSlope(), 9.764150943, PRECISION_DIGITS));
assertTrue(DoubleValueAssertionUtil.equals(stat.getYIntercept(), 1.509433962, PRECISION_DIGITS));
assertEquals(4, stat.getN());
}
}