*
   * @since 20.0
   */
  public static final class ScaleAndIndex {

    private final int scale;
    private final int index;

    private ScaleAndIndex(int scale, int index) {
      checkIndex(index, scale);
      this.scale = scale;
      this.index = index;
    }

    /**
     * Computes the quantile value of the given dataset.
     *