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\section{Methods Description} \label{sec:methods}  \subsection{GMM} \label{sec:methods-gmm}  \href{http://en.wikipedia.org/wiki/Expectation\%E2\%80\%93maximization_algorithm#mediaviewer/File:EM_Clustering_of_Old_Faithful_data.gif}{GMM \text[12pt] GMM  (Gaussian mixture modeling)} (Wikipedia) modeling)  method maximizes the likelihood of the data set using EM (expectation-maximization) method.  $n = $ number of observations