@Test public void testVarianceWithNoEntry() { RunningStats runningStats = new RunningStats(); Assert.assertEquals(0.0d, runningStats.stddev(), 0.001); }
public double stddev() { return Math.sqrt(variance()); }
RunningStats { public double stddev() { return Math.sqrt(variance()); } }
RunningStats { public double stddev() { return Math.sqrt(variance()); }  }
RunningStats { public double stddev() { return Math.sqrt(variance()); }  void push(double x); double mean(); double variance(); double stddev(); double skewness(); double kurtosis(); }
RunningStats { public double stddev() { return Math.sqrt(variance()); }  void push(double x); double mean(); double variance(); double stddev(); double skewness(); double kurtosis();  }