[mlpack-git] [mlpack/mlpack] Descriptive Statistics command-line program (#742)
Tham
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Fri Jul 29 04:21:03 EDT 2016
> + * @param rowMean Mean of the given vector.
> + * @return Skewness of the given vector.
> + */
> +double Skewness(const arma::rowvec& input,
> + const double& rowStd,
> + 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);
Why not just write
`skewness = M3 / (n*S3);`
Besides, according to the formula at this [page](http://www.macroption.com/skewness-formula/), I think the equation of population skewness should be
`std::sqrt(n) * M3 / (n*S3);`
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