I agree it's extremely important to recognize that heritability is a thing and that intelligence testing has very strong reliability and validity properties…this is increasingly recognized among policymakers. That does not extend to claims about group differences.
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Replying to @bechhof @Biorealism and
If I took a set of people from the top half of the IQ distribution and dropped them on an island, there would then be a group with a higher average IQ, entirely due to genetic differences.
1 reply 5 retweets 20 likes -
Replying to @gcochran99 @Biorealism and
Even on its face this is incorrect
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Replying to @bechhof @Biorealism and
No, it is correct. Assume an average of 100 and a standard deviation of 15: then the average of the top half is 112. Assume a narrow-sense heritability of 0,5: then the next generation has an average of 106. No further regression to the mean in later generations.
3 replies 2 retweets 21 likes -
Replying to @gcochran99 @bechhof and
Or assume that you picked from > 2 std and up ( > 132)): average of the first gen would be ~135. Average of the 2nd and later generations, assuming 0.5 narrow-sense heritability, would be ~118. The smartest population in the world.
2 replies 2 retweets 15 likes -
Replying to @gcochran99 @Biorealism and
This is why you need more Turkheimer in your life
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Replying to @bechhof @Biorealism and
Turkheimer thinks that there is an ethical principle that keeps things he doesn't like from happening. Not so.
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Replying to @bechhof @Biorealism and
"it is a matter of ethical principle that individual and cultural accomplishment is not tied to the genes in the same way as the appearance of our hair." So he said. Someone should have informed homo erectus.
1 reply 5 retweets 25 likes -
Replying to @gcochran99 @Biorealism and
His phrasing is weird, but this seems clearly true since both the potential for accomplishment and how accomplishment is defined are functions of societal choices
3 replies 0 retweets 0 likes
This sounds great but it boils down to "it's only a societal choice to prefer working sewage systems to fecal contaminated water supplies" - true enough but not deceptive because you'd never come out and say that directly
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