@avibryant you might find this interesting in your capacity as Random Forester:
http://erikerlandson.github.io/blog/2016/05/26/measuring-decision-tree-split-quality-with-test-statistic-p-values/ …
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I've always wanted to try Kolmogorov-Smirnov -- something like t-digest might make that practical
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BTW: I've been getting interested in Mondrian Forests - it's a simple unsupervised online method of building decision trees.
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er, you used chi-squared :) Should have kept reading before replying!
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