Paul, he's not. This is standard statistics. You shouldn't control for a collider. See page 74 of this textbook: http://scunning.com/cunningham_mixtape.pdf …
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There is a way - find a case (or create one) where there is an exogenous shock to the marketplace. That's why the paper I linked earlier by
@PikaGoldin and Rouse is compelling. Also see audit studies done by@NeumarkDN.Thanks. Twitter will use this to make your timeline better. UndoUndo
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