Emil O W Kirkegaard on Twitter: "He is most known for the supposed social status x heritability interaction, which is actually due to Scarr (and Rowe), but since this seems to be incorrect anyway for Western countries, I don't know which of his many contributions you want to single out.… https://t.co/Gr0b064JUM"

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Nathaniel Bechhofer ‏ @bechhof 18 May 2018

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Replying to @Biorealism @SilverVVulpes and

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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Gregory Cochran‏ @gcochran99 19 May 2018

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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 26 likes

Nathaniel Bechhofer ‏ @bechhof 19 May 2018

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Replying to @gcochran99 @Biorealism and

Even on its face this is incorrect

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Gregory Cochran‏ @gcochran99 19 May 2018

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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 27 likes

Gregory Cochran‏ @gcochran99 19 May 2018

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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 19 likes

Nathaniel Bechhofer ‏ @bechhof 19 May 2018

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Replying to @gcochran99 @Biorealism and

This is why you need more Turkheimer in your life

2 replies 0 retweets 2 likes

Gregory Cochran‏ @gcochran99 19 May 2018

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Replying to @bechhof @Biorealism and

What is there to disagree with?

1 reply 0 retweets 2 likes

Nathaniel Bechhofer ‏ @bechhof 19 May 2018

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Replying to @gcochran99 @Biorealism and

Dude read his piece about how heritability of group differences is not well defined

4 replies 0 retweets 1 like

Emil O W Kirkegaard‏ @KirkegaardEmil 19 May 2018

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Replying to @bechhof @gcochran99 and

Turkheimer is the top FUDster on the topic. We also know why he does it. If one really thinks that, obviously one will do everything in one's power to muddle the waters, which he does expertly. Turkheimer is a very smart guy who knows the field well. http://www.unz.com/jthompson/psychological-predictions-eric/ …pic.twitter.com/xMA8Fc1efP

1 reply 1 retweet 11 likes

Gregory Cochran‏ @gcochran99 19 May 2018

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Replying to @KirkegaardEmil @bechhof and

Has he come up with a fundamental new insight? Or a powerful new method?

1 reply 0 retweets 1 like

Emil O W Kirkegaard‏ @KirkegaardEmil 19 May 2018

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Replying to @gcochran99 @bechhof and

He is most known for the supposed social status x heritability interaction, which is actually due to Scarr (and Rowe), but since this seems to be incorrect anyway for Western countries, I don't know which of his many contributions you want to single out.

1:20 PM - 19 May 2018

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1. Holtz‏ @Biorealism 19 May 2018
  
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  Replying to @KirkegaardEmil @gcochran99 and
  
  Yeah, recent studies with larger sample size show low SES doesn't reduce heritability of cognitive ability.http://www.pnas.org/content/early/2017/11/28/1708491114 …
  
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1. Emil O W Kirkegaard‏ @KirkegaardEmil 19 May 2018
  
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  Replying to @KirkegaardEmil @gcochran99 and
  
  I thought his 1991 paper here was excellent even though it is mostly just an expansion on Jensen's work from the 1970s (perhaps unknown to him at submission). http://people.virginia.edu/~ent3c/papers2/Articles%20for%20Online%20CV/(70)%20Turkheimer%20(1991).pdf …
  
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