Rindermann (Cognitive Capitalism, 2018) writes: Contradicting common beliefs, National Socialists were opposed to intelligence research (Becker, 1938; Jaensch, 1938): in their view, intelligence research would represent a ‘supremacy of Bourgeoisie spirit’ (Jaensch, 1938, p. 2); intelligence measurement would be an instrument ‘of Jewry’ to ‘fortify its hegemony’ (p. 3); selection in schools according to intelligence […]

I wish to coin a fallacy I’ve seen a number of times, exemplified in this paper: Kempthorne, O. (1978). A BIOMETRICS INVITED PAPER: Logical, epistemological and statistical aspects of nature-nurture data interpretation. Biometrics, 1-23. Abstract: In this paper the nature of the reasoning processes applied to the nature-nurture question is discussed in general and with […]

Most readers are probably aware of the fraud accusations against Cyril Burt on account of various claims, but in particular the repeated digits across populations and other numerical irregularities. There’s also the case of the supposed missing research assistants/coauthors. I came across a particularly illuminating account, worth sharing here: Jensen, A. R. (1992). “Scientific fraud […]

In 2016, a Brazilian PHD student with access to the Brazilian Pelotas dataset was kind enough to run a few regressions for us. We apparently forgot to make the results public, but do so now so others can see. I have also previously analyzed some of this data which was later published in an obscure […]

Jensen spent decades trying to convince people that the g factor (general intelligence) is the primary reason why IQ tests predict stuff, not whatever mental abilities the tests appear to measure or what the makers wanted to measure. E.g. as written in: Jensen, A. R. (2002). “Psychometric g: Definition and substantiation“. In R. J. Sternberg […]

Nature has a review of Robert Plomin’s new book by some random lefty historian data-free reasoning type called Nathaniel Comfort (he follows the usual pattern of having a background in biology, as the usual suspects). Among the usual claims without any supporting references we find this one: Crude hereditarianism often re-emerges after major advances in […]

People commonly ascribe large effects to having this or that teacher, or this or that classmate. They usually cite some anecdotes from their personal lives for this, but large sample size, systematic data are strongly negative on the idea. This means that to the extent one can measure things, teachers are largely interchangeable in terms […]

The theory seems obvious: since stereotypes are just beliefs about groups, having more accurate stereotypes would be expected to be related to intelligence, just as having more accurate beliefs on most other topics relates to intelligence. The theoretical expectation of stereotype accuracy and intelligence is stronger because it’s a direct test of pattern recognition with […]

I don’t think Malcolm Gladwell has been debunked hard enough, so here’s my contribution towards that goal. For Steven Pinker’s take, see here. Gladwell is essentially a story teller, and while he doesn’t directly make stuff up, as far as we know (unlike e.g. Jonah Lehrer), he plays fast and loose with sources. Some years […]