It may be just sampling error due to tiny Ns:pic.twitter.com/WFxrZ2dnsA
Implausibly large heritability differences for cigarette use variables between US W-B. Maybe diff measurement error? https://www.researchgate.net/publication/304360108_Racial_Differences_in_Heritability_of_Cigarette_Smoking_in_Adolescents_and_Young_Adults …pic.twitter.com/hU2gHmGSW2
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Not that tiny Ns, and sampling error is random in direction.
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Black sample small for a twin study & as the same sample is used longitudinally sampling errors aren't independent over time
End of conversation
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