There had been stuff floating around about this — but it is pretty egregious. https://roamanalytics.com/2016/10/28/are-categorical-variables-getting-lost-in-your-random-forests/ …
15+ years after the release of the randomForests package... Someone finally discovers a key bug in the way that RFs use categorical input variables.https://twitter.com/JmlrOrg/status/1058445343547969537 …
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