Interactions are still not important: not in medical data either
Yesterday I wrote about a study I did of the OKCupid dataset. The point was to show that interaction effects are almost always tiny and you should adjust your effect…
Interactions are generally not important in social science
Some years ago both me and Jonatan Pallesen looked into the generality of statistical interaction effects. These look like this: In real life, however, interactions are mostly not a real…
Which country do you fit in?
There are hundreds of values tests on the internet. Almost all of these are theory-based also known as made-up dimensions. These are dimensions that one could think of, make some…
Dimensions of the dating mind
A decade ago I got into my first media circus by scraping the OKCupid dating site. The site uses (or used) a novel approach of having users answer 100s of…
g-loadings of tests on taketest.xyz
Many people were asking me about the g-loadings of the tests on the site. The answer is somewhat complicated because: We don't have many people who took all the tests.…
The making of the 8 dimensional US political test
Some days ago I posted a new US political ideology test on X. It went decently viral and currently has collected about 28k first time completions. You can find the…
Semen quality and intelligence
Back in the 2000s, there was some interest in semen quality and intelligence: Arden, R., Gottfredson, L. S., Miller, G., & Pierce, A. (2009). Intelligence and semen quality are positively…
Explore psychological correlations at taketest.xyz
Have just finished a neat update to the site. On the correlations page you can now see the matrix of cross-test sample sizes: You can click any of the green…
Race differences in reaction time: data from NHANES 3
Whenever race differences in cognitive ability broadly speaking are brought up, they encounter huge skeptical and emotional opposition. This is understandable, though not grounded in science. One common claim is…
Migrant performance on PISA worldwide
There are some data memes floating around like this one: In German, it shows the performance of Turks on PISA math by year and destination country. It can be seen…
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