Tomorrow at INFORMS's Data Mining Cluster @ 1:30pm, I'll be presenting my work (with Inbal Yahav) "The Forest or the Trees? Tackling Simpson’s Paradox with Classification and Regression Trees". I'll show the special use of the tree structure that we take advantage of in order to detect whether a dataset has Simpson's Paradox (reversal of a causal direction when disaggregating the data). See our working paper on SSRN for more details.