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wallowinmaya comments on Get genotyped for free ( If your IQ is high enough) - Less Wrong
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He mentions it in the talk. They are searching for people with cognitive abilities at least +3 SD above average ( which equals IQ 145.) (EDIT: At 45:20 he starts talking about the study-design. )
(And is best expressed as SDs because IQ numbers from one test are not directly equivalent to those on another test.)
Alright, I've changed the title.
I was under the impression that an IQ of 145 puts one in the 99.75% percentile but I never investigated too closely. Some stats:
" rarity on a 15 SD (e.g. Wechsler) and 16 SD (e.g. Stanford-Binet) scale: 145 99.8650032777% 1 in 741
99.7542037453% 1 in 407
Hm, I've trusted Steve Hsu on this. I don't know if they only accept people in the 99,9th percentile or if folks in the 99,865th meet the criteria, too. I guess it doesn't matter too much.
EDIT: And I've changed the title again. Now it should be sufficiently vague.