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In exploratory data analysis, we are often interested in identifying promising pairwise associations for further analysis while filtering out weaker ones. This can be accomplished by computing a measure of dependence on all variable pairs and examining the highest-scoring pairs, provided the measure of dependence used assigns similar scores to equally noisy relationships of different types. This property, called equitability and previously formalized, can be used to assess measures of dependence along with the power of their corresponding independence tests and their runtime. Here we present an empirical evaluation of the equitability, power against independence, and runtime of several leading measures of dependence. These include the two recently introduced and simultaneously computable statistics MICe, whose goal is equitability, and TICe, whose goal is power against independence. Regarding equitability, our analysis finds that MICe is the most equitable method on functional relationships in most of the settings we considered. Regarding power against independence, we find that TICe and Heller and Gorfine’s SDDP share state-of-the-art performance, with several other methods achieving excellent power as well. Our analyses also show evidence for a trade-off between power against independence and equitability consistent with recent theoretical work. Our results suggest that a fast and useful strategy for achieving a combination of power against independence and equitability is to filter relationships by TICe and then to rank the remaining ones using MICe. We confirm our findings on a set of data collected by the World Health Organization.

An empirical study of the maximal and total information coefficients and leading measures of dependence