"curious whats going on here hmmm"https://twitter.com/NickWolfinger/status/1103403311577718784 …
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but, looking at changes in R^2 for all of these explanatory variables with and without AFQT isn't going to get you what you suggested in your analysis, because those other explanatory variables are collectively almost surely quite correlated with AFQT
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that is to say, your R^2 = 0.48 probably includes a substantial effect from AFQT (or whatever that proxies) simply mediated by those other, plausibly-downstream variables so getting only a 0.02 R^2 increase from adding it doesn't mean its explanatory power is so limited
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