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Vaniver comments on 2013 Survey Results - Less Wrong
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I don't have solid numbers myself, but percentile of test-takers should underestimate percentile of population. However, there is regression to the mean to take into account, as well as that many people take the SAT multiple times and report the most favorable score, both of which suggest that score on test should overestimate IQ, and I'm fudging it by treating those two as if they cancel out.
Don't most people who report IQ scores do the same thing if they have taken multiple tests?
Possibly. My suspicion is that less people have taken multiple professional IQ tests (I've only taken one professional one) than multiple SATs (I think I took it three times, at various ages). I score significantly better on the Raven's subtest than on other subtests, and so my IQ.dk score was significantly higher than my professional IQ test last year- but this year I only reported the professional one, because that was all that was asked for. (I might not be representative.)
Not if they followed the survey instructions, which asked for only the scores from the most recent professional IQ test they took.