Chanda Chisala did not come up with the UK race gaps argument

Many people seem to have this impression. These arguments go back more than 10 years. This post quotes various UK newspaper articles going back to 2006: Underperformance of Poor White British Boys. Racial Reality. June 2, 2010 John Fuerst is probably the first hereditarian to seriously grapple with these issues: Partially falsified. Unwelcome Discovery. February…

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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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Birth order effects and achievement: autism-hormonal model

Back in 2018, Scott Alexander published a troll post: Fight Me, Psychologists: Birth Order Effects Exist And Are Very Strong. From casual observation of people in rationalist community, and other any coffee salon demographics group, one can notice that there are a preponderance of first born. Some of this is due to confounding with fertility:…

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Review: Psychological Testing: Theory and Practice (Colin Cooper)

Cooper, C. (2018). Psychological testing: theory and practice. Routledge. This is a pretty food good introduction to psychometrics (the science of psychological measurement). There is the now customary dislike for NHST, more focus on effect sizes, mostly equation-free presentation (except when needed). The table of contents gives a good idea of the conceptual space covered:…

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