Esempi in Java per StatTracker.sampleVariance

Esempio n. 1

File: TestStats.java Progetto: rcameron-oculus/aperture-tiles

  @Test
  public void testSampleVariance() {
    StatTracker s = new StatTracker();
    s.addStat(0.0);
    s.addStat(1.0);
    s.addStat(2.0);
    // sum(-1.0^2 + 0.0^2 + 1.0^2)/2
    Assert.assertEquals(1.0, s.sampleVariance(), EPSILON);

    // sum(-1.5^2 + -0.5^2 + 0.5^2 + 1.5^2)/3
    s.addStat(3.0);
    Assert.assertEquals(5.0 / 3.0, s.sampleVariance(), EPSILON);
  }