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Added tests for methods computing variance from mean, removed obsolete tests. 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/math/trunk@141378 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Phil Steitz 2004-07-11 18:42:07 +00:00
parent fbae62101e
commit 75dc4f119a
1 changed files with 6 additions and 42 deletions
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48
src/test/org/apache/commons/math/stat/StatUtilsTest.java
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@ -23,7 +23,7 @@ import org.apache.commons.math.TestUtils;
/**
* Test cases for the {@link StatUtils} class.
* @version $Revision: 1.17 $ $Date: 2004/05/24 05:33:42 $
* @version $Revision: 1.18 $ $Date: 2004/07/11 18:42:07 $
*/
public final class StatUtilsTest extends TestCase {
@ -62,6 +62,7 @@ public final class StatUtilsTest extends TestCase {
assertEquals("sum", sum, StatUtils.sum(values), tolerance);
assertEquals("sumsq", sumSq, StatUtils.sumSq(values), tolerance);
assertEquals("var", var, StatUtils.variance(values), tolerance);
assertEquals("var with mean", var, StatUtils.variance(values, mean), tolerance);
assertEquals("mean", mean, StatUtils.mean(values), tolerance);
assertEquals("min", min, StatUtils.min(values), tolerance);
assertEquals("max", max, StatUtils.max(values), tolerance);
@ -87,47 +88,6 @@ public final class StatUtilsTest extends TestCase {
StatUtils.variance(values) == 0);
}
public void testSkewAndKurtosis() {
double[] values =
{
12.5,
12,
11.8,
14.2,
14.9,
14.5,
21,
8.2,
10.3,
11.3,
14.1,
9.9,
12.2,
12,
12.1,
11,
19.8,
11,
10,
8.8,
9,
12.3 };
assertEquals("mean", 12.40455, StatUtils.mean(values), 0.0001);
assertEquals("variance", 10.00236, StatUtils.variance(values), 0.0001);
}
public void testProductAndGeometricMean() throws Exception {
double[] values = { 1.0, 2.0, 3.0, 4.0 };
assertEquals(
"Product not expected",
24.0,
StatUtils.product(values),
Double.MIN_VALUE);
}
public void testArrayIndexConditions() throws Exception {
double[] values = { 1.0, 2.0, 3.0, 4.0 };
@ -309,6 +269,10 @@ public final class StatUtilsTest extends TestCase {
// test many
x = new double[] {one, two, two, three};
TestUtils.assertEquals(0.5, StatUtils.variance(x, 2, 2), tolerance);
// test precomputed mean
x = new double[] {one, two, two, three};
TestUtils.assertEquals(0.5, StatUtils.variance(x,2.5, 2, 2), tolerance);
}
public void testMax() {