@Test
public void testQuadraticMean() {
final double[] values = {1.2, 3.4, 5.6, 7.89};
final DescriptiveStatistics stats = new DescriptiveStatistics(values);
final int len = values.length;
double expected = 0;
for (int i = 0; i < len; i++) {
final double v = values[i];
expected += v * v / len;
}
expected = Math.sqrt(expected);
Assert.assertEquals(expected, stats.getQuadraticMean(), Math.ulp(expected));
}
