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\item Howeveer, test statistics are not comparable since they are not on the same scale.  \item To make these score distributions comparable, we converted scores to their corresponding empirical p values.  \item We defined these p values as the proportion of observed values under the null model that are greater than or equal to the observed value under the alternative model.  \item we We  then compared the distribution of empirical p values for the differet test statistics by plotting empirical cumulative ditribution function (ECDF) under each method. \end{itemize}  \end{itemize}