The within-person design: a selective review

The within-person (or intra-individual or within‐individual or …), design is a longitudinal design where we follow people over time as they change on some purported cause, and look at whether the purported effect also varies accordingly. This simple design is surprisingly underused despite having the strong advantage that it controls by design for both genetic…

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Hereditarian predictions

Putting these in writing in a single place for ease of reference. Unfortunately, no one wrote down all these predictions some years ago to show they really were predictions, but one could probably find textual evidence for many of these in various papers and blogposts. Some of them have been supported already, and some are…

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Beware small biases: the case of height

See prior post on self vs. other measurements of personality for a similar take. Height is the favorite trait in ‘behavioral’ genetics: it’s easy, fast and cheap to measure, continuous as opposed to dichotomous or discrete, highly polygenic, highly heritable, and no one complains to the PC police about it. So we have tons of…

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Fake news on James Watson’s DNA

Some readers might remember back in 2007, it was widely reported that Chad James Watson has African ancestry: New York Times: DNA Pioneer’s Genome Blurs Race Lines A new analysis of Dr. Watson’s genome shows that he has 16 times the number of genes considered to be of African origin than the average white European…

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Mainstreamers keep making progress: educational attainment variation “likely” caused by ancestry variation in Europe

Lawson, D. J., Davies, N. M., Haworth, S., Ashraf, B., Howe, L., Crawford, A., … & Timpson, N. J. (2020). Is population structure in the genetic biobank era irrelevant, a challenge, or an opportunity?. Human genetics, 139(1), 23-41. Replicable genetic association signals have consistently been found through genome-wide association studies in recent years. The recent…

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