<p>In <a href="https://github.com/mlpack/mlpack/pull/742#discussion_r73795163">src/mlpack/methods/preprocess/preprocess_describe_main.cpp</a>:</p>
<pre style='color:#555'>&gt; + * @param rowStd Standard Deviation of the given vector.
&gt; + * @param rowMean Mean of the given vector.
&gt; + * @return Kurtosis of the given vector.
&gt; + */
&gt; +double Kurtosis(const arma::rowvec&amp; input,
&gt; +    const double&amp; fStd,
&gt; +    const double&amp; fMean,
&gt; +    const bool population)
&gt; +{
&gt; +  double kurtosis = 0;
&gt; +  const double M4 = SumNthPowerDeviations(input, fMean, 4);
&gt; +  const double n = input.n_elem;
&gt; +  if (population)
&gt; +  {
&gt; +    // Calculate Population Excess Kurtosis
&gt; +    double M2 = SumNthPowerDeviations(input, fMean, 2);
</pre>
<p>I think this is a good candidate of const too, as other variables in this function. <br>
Sorry of being picky on const correctness.</p>

<p>After this is fixed, I think the codes are ready to merge</p>

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