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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Against trust in neuroscience

Neuroscience enjoys a good public perception of scientific rigor. Unfortunately, it’s undeserved. Statistically speaking, a scientific field cannot be rigorous when it is underpowered and has a high researcher degree of freedom. This combo is exactly what neuroscience has, so we get stuff like: Button, K. S., Ioannidis, J. P., Mokrysz, C., Nosek, B. A.,…

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Motivation and IQ scores

Der er is a famous meta-analysis showing that motivation affects IQ scores to a substantial degree: Duckworth, A. L., Quinn, P. D., Lynam, D. R., Loeber, R., & Stouthamer-Loeber, M. (2011). Role of test motivation in intelligence testing. Proceedings of the National Academy of Sciences, 108(19), 7716-7720. Intelligence tests are widely assumed to measure maximal…

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National IQs: measurement invariance studies

A lot of national intelligence criticism focuses on the measurement validity. Are the scores really comparable across countries? Most of the criticism is armchair stuff, or vaguer claims based on smaller studies such as this one: Multiple examples from different societies demonstrating that https://t.co/drJKXid5W0 — Will (@Evolving_Moloch) August 21, 2020 However, there are proper statistical…

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