Group differences on the Wonderlic short IQ test
I have written a couple of times about how to measure intelligence well and in a short time. Mainly I was interested in which single type of item is best…
A new dataset of science knowledge by country
By coincidence I found this paper the other day: Sturgis, P., Brunton-Smith, I., Allum, N., & Fuglsang, S. (2024). Testing the cultural-invariance hypothesis: A global analysis of the relationship between…
Heritability for individuals too, and the application to group differences
It is commonly said that heritability is a population level statistic that doesn't apply to individuals. For instance, here's Robert Plomin et al's textbook Behavioral Genetics (2017, 7th edition), the…
So you’re interested in the national IQ of a country, what do you do?
You might know the following scenario: you or your ancestors migrated from a given country, or you yourself is a member of the major ethnic group of some country. At…
Whose responsibility is it anyway?
In our third installment of our new work in this issue of Mankind Quarterly, we're branching off into political science: Jensen, S., & Kirkegaard, E. O. W. (2023). Who Believes…
Write simple questions in surveys
There is a movement on Wikipedia, and elsewhere, to use a simplified version of English. This is mainly achieved through the limitation of which words can appear. The chief goal…
Can you only talk to people within X IQ of your own?
There is this claim sometimes seen when discussing highly gifted people. One interested reader emailed me to ask where it was that Arthur Jensen made this claim: Anyway, what I…
Autistic children attend a course delivered by a specialised teacher Caroline Berge (L) at the College du Parc in Aulnay-sous-Bois, northeast of Paris on October 9, 2019. (Photo by Christophe ARCHAMBAULT / AFP) (Photo by CHRISTOPHE ARCHAMBAULT/AFP via Getty Images)
Autism diagnoses are rising, yes, but autism, probably not
We can read in many outlets that the reason autism is increasing in prevalence is that clinicians are becoming more aware of it. The idea being that autism was already…
New study: Intelligence and Group Differences in Preference for Breasts over Buttocks
George Francis and I have a new exciting study out, the formal and finalized version of George Francis' 2022 blogpost: Francis, G., & Kirkegaard, E. O. W. (2023). Intelligence and…
New study out: Systemic Racism Does Not Explain Variation in Race Gaps on Cognitive Tests
The new issue of Mankind Quarterly just came out. It appears I have no less than 6 pieces in this, so let's get started. Kirkegaard, E. O. W. (2023). Systemic…
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