Study almost convincingly shows that people with a variety of issues self-select into Mensa. http://www.sciencedirect.com/science/article/pii/S0160289616303324 …pic.twitter.com/oV9eZFkhjo
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On the plus side, useful cite to send anyone trying to argue that something can be learned from a Mensa sample: no, utterly unrepresentative
It can be shown empirically too. If one asks Mensans for income etc, the implied r with IQ will be less than what good samples find.
