The benefits of smart friends: Among 715 adolescents, their middle school best friend's IQ predicted increases in their own intelligence 3 years later (controlling for adolescents' prior own IQ) Fascinating work by @FSNole57! https://psyarxiv.com/t7pdx/
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Say my IQ is 110 but I have a bad day and test 100. I'd still have the friends that someone with a 110 IQ would, so that would help explain my future, properly measured IQ.
That's right. It's a special case of the general problem of multivariate analysis with measurement error in predictors. If not corrected for, validity will spread to correlates of the true causes. http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0152719 …
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Thank you for sharing! I hadn't seen this argument before, but it makes total sense!
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That is such a classic paper, great explanation of why you should always be skeptical of claims based on multiple regression. I hope people are still sharing it 10 years from now.
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