  Here I present the analytic form of two common distance metrics, the
symmetrised Kullback-Leibler Divergence and the Kolmogorov-Smirnov statistic,
as well as an extension of the Kolmogorov-Smirnov statistic for comparing
theoretical gamma distributions. In doing so, I also present the analytic
solution to the intersection of two gamma distributions. Lastly, I provide
examples that demonstrate the similarity between these distance metrics and
their usefulness in describing the separability of gamma distributions.
