Douglas_Knight comments on Open thread, 7-14 July 2014 - Less Wrong
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Your third link begins with the Griffe taking numbers from Janet Hyde, who is on the opposite end of the spectrum. The difference is that she downplays the magnitude of the standard deviation difference. Isn't the main concern the source of the numbers, not the calculation? It's just a normal distribution calculation.
(I don't actually believe that intelligence is normally distributed, so I don't believe the argument.)
If you don't think intelligence is normally distributed, isn't that a problem for how true his results are and why one might want third-parties' opinion? And I'm not sure that affects his rank-ordering argument very much; that seems like it might be reasonably insensitive to the exact distribution one might choose.