@Test
public void testSummaryConsistency() {
final DescriptiveStatistics dstats = new DescriptiveStatistics();
final SummaryStatistics sstats = new SummaryStatistics();
final int windowSize = 5;
dstats.setWindowSize(windowSize);
final double tol = 1E-12;
for (int i = 0; i < 20; i++) {
dstats.addValue(i);
sstats.clear();
double[] values = dstats.getValues();
for (int j = 0; j < values.length; j++) {
sstats.addValue(values[j]);
}
TestUtils.assertEquals(dstats.getMean(), sstats.getMean(), tol);
TestUtils.assertEquals(new Mean().evaluate(values), dstats.getMean(), tol);
TestUtils.assertEquals(dstats.getMax(), sstats.getMax(), tol);
TestUtils.assertEquals(new Max().evaluate(values), dstats.getMax(), tol);
TestUtils.assertEquals(dstats.getGeometricMean(), sstats.getGeometricMean(), tol);
TestUtils.assertEquals(new GeometricMean().evaluate(values), dstats.getGeometricMean(), tol);
TestUtils.assertEquals(dstats.getMin(), sstats.getMin(), tol);
TestUtils.assertEquals(new Min().evaluate(values), dstats.getMin(), tol);
TestUtils.assertEquals(dstats.getStandardDeviation(), sstats.getStandardDeviation(), tol);
TestUtils.assertEquals(dstats.getVariance(), sstats.getVariance(), tol);
TestUtils.assertEquals(new Variance().evaluate(values), dstats.getVariance(), tol);
TestUtils.assertEquals(dstats.getSum(), sstats.getSum(), tol);
TestUtils.assertEquals(new Sum().evaluate(values), dstats.getSum(), tol);
TestUtils.assertEquals(dstats.getSumsq(), sstats.getSumsq(), tol);
TestUtils.assertEquals(new SumOfSquares().evaluate(values), dstats.getSumsq(), tol);
TestUtils.assertEquals(dstats.getPopulationVariance(), sstats.getPopulationVariance(), tol);
TestUtils.assertEquals(
new Variance(false).evaluate(values), dstats.getPopulationVariance(), tol);
}
}
@Test
public void testWindowSize() {
DescriptiveStatistics stats = createDescriptiveStatistics();
stats.setWindowSize(300);
for (int i = 0; i < 100; ++i) {
stats.addValue(i + 1);
}
int refSum = (100 * 101) / 2;
Assert.assertEquals(refSum / 100.0, stats.getMean(), 1E-10);
Assert.assertEquals(300, stats.getWindowSize());
try {
stats.setWindowSize(-3);
Assert.fail("an exception should have been thrown");
} catch (MathIllegalArgumentException iae) {
// expected
}
Assert.assertEquals(300, stats.getWindowSize());
stats.setWindowSize(50);
Assert.assertEquals(50, stats.getWindowSize());
int refSum2 = refSum - (50 * 51) / 2;
Assert.assertEquals(refSum2 / 50.0, stats.getMean(), 1E-10);
}
public void checkremoval(
DescriptiveStatistics dstat, int wsize, double mean1, double mean2, double mean3) {
dstat.setWindowSize(wsize);
dstat.clear();
for (int i = 1; i <= 6; ++i) {
dstat.addValue(i);
}
Assert.assertTrue(Precision.equalsIncludingNaN(mean1, dstat.getMean()));
dstat.replaceMostRecentValue(0);
Assert.assertTrue(Precision.equalsIncludingNaN(mean2, dstat.getMean()));
dstat.removeMostRecentValue();
Assert.assertTrue(Precision.equalsIncludingNaN(mean3, dstat.getMean()));
}