@MikeAnissimov @hbdchick among other things he calculates a 2/3 st dev drop in South African iq in 115 years just from composition
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Replying to @MikeAnissimov
@MikeAnissimov@hbdchick iq heritability + big differences in reproduction by iq for a few generations1 reply 0 retweets 0 likes -
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Replying to @MikeAnissimov
@MikeAnissimov@hbdchick increase is a hard, slow, linear process; decrease can be fast/exponential1 reply 0 retweets 0 likes -
Replying to @sarahdoingthing
@MikeAnissimov when traits aren't under selection (or are actively being selected out) it's easier to lose them than to get new ones1 reply 0 retweets 1 like -
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Replying to @MikeAnissimov
@MikeAnissimov seems easy to model, worst case say top 15% doesn't reproduce at all & bottom 15% each have 10 kids, FAST shift in 1 gen1 reply 0 retweets 0 likes -
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Replying to @MikeAnissimov
@MikeAnissimov probably a decent estimate for some populations; worldwide much more extreme. also keep in mind generational compounding.1 reply 0 retweets 0 likes
@MikeAnissimov just saw this as I said that, haha https://westhunt.wordpress.com/2014/03/23/burning-seed-corn/ …
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