[mlpack-git] [mlpack/mlpack] Descriptive Statistics command-line program (#742)

[Tham]

> +    const double& rowMean,
> +    const bool population)
> +{
> +  double skewness = 0;
> +  double S3 = pow(rowStd, 3);
> +  double M3 = SumNthPowerDeviations(input, rowMean, 3);
> +  double n = input.n_elem;
> +  if (population)
> +  {
> +    // Calculate Population Skewness
> +    skewness = n * M3 / (n * n * S3);
> +  }
> +  else
> +  {
> +    // Calculate Sample Skewness
> +    skewness = n * M3 / ((n-1) * (n-2) * S3);

@keonkim  I think you are right, my mistakes, thanks for your correction.

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