public void testWeightedMean() {
Mean mean = new Mean();
assertEquals(
expectedWeightedValue(),
mean.evaluate(testArray, testWeightsArray, 0, testArray.length),
getTolerance());
assertEquals(
expectedValue(),
mean.evaluate(testArray, identicalWeightsArray, 0, testArray.length),
getTolerance());
}
@Test
public void testMeanCalculation() {
Mean a = new Mean();
a.add(1);
assertEquals(1, a.count());
assertEquals(1d, a.mean(), 0.00001d);
a.add(1);
assertEquals(2, a.count());
assertEquals(1d, a.mean(), 0.00001d);
a.toString();
Mean b = new Mean();
b.add(0.5);
assertEquals(1, b.count());
assertEquals(0.5d, b.mean(), 0.00001d);
b.add(2);
assertEquals(2, b.count());
assertEquals(1.25d, b.mean(), 0.00001d);
b.toString();
Mean c = new Mean();
assertEquals(0, c.count());
assertEquals(0d, c.mean(), 0.00001d);
c.toString();
}
public void testSmallSamples() {
Mean mean = new Mean();
assertTrue(Double.isNaN(mean.getResult()));
mean.increment(1d);
assertEquals(1d, mean.getResult(), 0);
}
