Method populationVariance

corpus/java/training/guava/math/Stats.java:216–225

Returns the population variance of the values. The count must be non-zero. This is guaranteed to return zero if the the dataset contains only exactly one finite value. It is not guaranteed to return zero when the dataset con

()

   * @throws IllegalStateException if the dataset is empty
   */
  public double populationVariance() {
    checkState(count > 0);
    if (isNaN(sumOfSquaresOfDeltas)) {
      return NaN;
    }
    if (count == 1) {
      return 0.0;
    }
    return ensureNonNegative(sumOfSquaresOfDeltas) / count();
  }

  /**
   * Returns the