Prep companies have an obvious commercial interest in saying they produce large effects
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You would think there would be at least one large, independently conducted RCT on the effects of prep/coaching on standardized admissions tests. But as far as I can tell that isn’t true
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The College Board for a long time said coaching had no effect. Until they partnered with Khan Academy and said it does
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Observational studies suggest small-but-not-zero effects. But without random assignments, those estimates could be residual confounding of practice or selection https://files.eric.ed.gov/fulltext/ED505529.pdf …
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Standardized admissions tests are such a big and consequential part of American life. Coaching/prep effects are hugely controversial and a firm answer would totally change that conversation. How do we not have better data?
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End of conversation
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That's astonishing! Qmazed there's still no RCT's...Well there's def parts that can be gamed: vocab memorizing. In a general sense I think selective schools have started to use additional proxies for ability like SAT Math subject tests, # AP classes and scores, and competitions
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