In many ways, my science — and my colleagues’ science — generally involves collecting evidence for obvious hypotheses that are mainly denied by leftist-leaning people (more precisely, egalitarian). Here’s a brief review. Stereotypes about major demographic groups are quite accurate Jussim of course already showed this, but since it’s still frequently denied, seems that we […]

Whitley, E., Deary, I. J., Ritchie, S. J., Batty, G. D., Kumari, M., & Benzeval, M. (2016). Variations in cognitive abilities across the life course: Cross-sectional evidence from Understanding Society: The UK Household Longitudinal Study.Intelligence, 59, 39–50. Background Populations worldwide are aging. Cognitive decline is an important precursor of dementia, illness and death and, […]

Back in January, Steve Hsu did an interview with Daphne Martschenko who is a phd candidate at Cambridge in education. She’s basically doing science journalism on behavioral genetics as far as I can tell. Now there’s a new interview up. I have some comments to it because Steve was a little too nice. Bias from […]

So, I posted this: Abstract We used data from the PING study (n≈1200) to examine the relationship between cognitive ability, socioeconomic outcomes and genomic racial ancestry. We found that when genomic ancestry was not included in models, self-reported race/ethnicity (SIRE) was a useful predictor of cognitive ability/S, but when genomic ancestry was included, SIRE lost […]

Some of the talks from ISIR 2016 in Saint Petersburg are now online. In particular, I enjoyed Detterman’s talk, but of course I think he is too pessimistic about reproductive genetics. All the talks were recorded, but only the long ones with the most famous people are published so far, so you will have to […] Analysis of the data collected so far, presented side by side with R code. It will be expanded into a proper paper and submitted to OQSPS soonish. Soonish here meaning when Noah gets around to do it! Due to the surprising results, we should probably do a follow-up replication using new subjects. These results […]

I was recently asked to suggest introductory reviewing materials for bright laymen (see also my previous post). I ended up giving the following recommendations: – Intelligence: A very short introduction (2001, by Deary, very mainstream researcher). 132 pages. Libgen – Intelligence: All that matters. 2015. Ritchie (young, mainstream researcher). 160 pages. Libgen Bit more technical, […]

For some research designs, one pays the participants by the amount of time they spend on the task (like regular work). For other designs where one does not, usually participants are able to drop out if one annoys them too much. In both cases it is important to use brief measures. Still, when one uses […]

There is a lot of research on the link between crime and cognitive ability. (For criminal outcomes, see the problems in my previous post.) E.g. Is the Association between General Cognitive Ability and Violent Crime Caused by Family-Level Confounders? We linked longitudinal Swedish total population registers to study the association of general cognitive ability (intelligence) […]