Hiding sex differences: not a myth

Russell Warne has a new post: Implications of average group differences for the design of intelligence tests He writes: The implication is that if test creators can force an average difference to disappear for one pair of groups (i.e., males and females), then any differences or lack of differences are also engineered into the tests….

COVID vaccine and fertility: no need to worry (June 14th 2021)

I know some people are who are into conspiratorial thinking about COVID vaccines. Bill Gates trying to decrease your fertility stuff. Anyway, so I did the science thing, that is, I used a neutral search on an academic search engine to locate actual data on the question. Specifically, Google Scholar with the query “Covid vaccine…

New paper out: Intelligence and General Psychopathology in the Vietnam Experience Study: A Closer Look

Kirkegaard, E. O. W., & Nyborg, H. (2021). Intelligence and General Psychopathology in the Vietnam Experience Study: A Closer Look. Mankind Quarterly, 61(4). https://doi.org/10.46469/mq.2021.61.4.2 Prior research has indicated that one can summarize the variation in psychopathology measures in a single dimension, labeled P by analogy with the g factor of intelligence. Research shows that this…

New paper out: County-level USA: No Robust Relationship between Geoclimatic Variables and Cognitive Ability

This one came out in Februrary, so we are a bit behind, but that’s because I wanted to time the blogpost with the video. Aaaand the video is online now. Pesta, B. J., Fuerst, J. G. R., & Kirkegaard, E. (2021). County-level USA: No Robust Relationship between Geoclimatic Variables and Cognitive Ability. Journal of Geographical…

New video: Are There Complex Assortative Mating Patterns For Humans?

Forgot to blog this one earlier. It’s a video walkthrough of the usual sorts, based on my paper in Mankind Quarterly back from March: Kirkegaard, E. O. W. (2021). Are there Complex Assortative Mating Patterns for Humans? Analysis of 340 Spanish Couples. Mankind Quarterly, 61(3). https://doi.org/10.46469/mq.2021.61.3.12 Assortative mating for both physical and psychological traits is…