Are IQ scales interval or ordinal?
One of the more obscure objections to intelligence testing is that really the tests are only on ordinal scale, and thus many of the usual statistical operations are undefined. Recall,…
What did the new WGS UKBB study show?
I wasn't going to blog this, since I prefer not covering the same ground as others, but due to multiple requests and questions, I will cover it anyway. It's this…
Science vs. ideology on vertical transfers
Last year Marcus Feldman and Kevin Lala published one of those anti-hereditarian pieces: Lala, K. N., & Feldman, M. W. (2024). Genes, culture, and scientific racism. Proceedings of the National…
Herasight publishes their validation of IQ PGS; Nucleus open sources their models
There's two exciting news today in embryo selection. The technology is finally moving forward at an appreciable rate. Maybe we are not dysgenics doomed after all. First off, Herasight --…
How to norm a score
Suppose you have created a new scale of something ("Science Blog Rating Scale"). It can be psychology or some other soft science, but it doesn't have to be. Suppose you…
The genetics of beliefs
Nathan Cofnas wrote a great piece the other day, Beating Woke with Facts and Logic, which included this part: Beliefs Aren’t Genetically Determined Should we execute murderers? Raise taxes on…
Indian IQ in 1944
Some of you may have seen this table posted on X: Upon seeing the table, some have mistakenly concluded that the first row has British world scale IQs, but as…
New paper: Psychometric Analysis of the Multifactor General Knowledge Test
A while ago, Seb Jensen and I did this new study, and it was only released now due to technical issues: Kirkegaard, E. O. W., & Jensen, S. (2025). Psychometric…
Who has how much dysgenics? The worldwide picture
In 2024, Seb Jensen published a report over at Hanania's CSPI (Are We Getting Dumber?) summarizing his findings concerning the speed of global dysgenics. Due to various reasons, the formal…
Indian IQ in the USA: GSS data
Aaron has a new short piece on Indian IQ in the USA using the GSS. I decided to replicate this analysis with better methods. The GSS is somewhat of a…