<p>In <a href="https://github.com/mlpack/mlpack/pull/742#discussion_r72756960">src/mlpack/methods/preprocess/preprocess_describe_main.cpp</a>:</p>
<pre style='color:#555'>> +/**
> + * Calculates Skewness of the given vector.
> + *
> + * @param input Vector that captures a dimension of a dataset
> + * @param rowStd Standard Deviation of the given vector.
> + * @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);
</pre>
<p>I guess M3 mean moment 3?If so, I think write it as<br>
<code>M3/n</code> maybe can express your intention better</p>
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