IQ follows normal distribution except for bump on left side. See big study by @Russwarne This is a prediction from additive genetic model. The left bump comes from small number of genetic errors of large negative effect size as well as enviro damage.https://journals.sagepub.com/doi/abs/10.1177/1932202x13507969 …
Mensa (etc) as under-achievers club. http://www.sigmasociety.com/old/_coy01.html pic.twitter.com/1q8He07QWx
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Selection bias and signaling: you are most likely to join MENSA when you need a signal to compensate for lack of other signals, i.e. achievement.
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Successful high IQ individuals are busy using their minds, while underachievers cling to their scores to buoy their egos? Plausible.
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