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Differential psychology/psychometrics

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Read more about the article Worldwide results for migrant outcomes

Worldwide results for migrant outcomes

  • Post author:Emil O. W. Kirkegaard
  • Post published:20. October 2026
  • Post category:Immigration/intelligence / IQ / cognitive ability

I've researched the outcomes of migrants by country of origin in many studies and posts, but now with the power of AI, I've been quickly able to compile all of…

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Read more about the article Adult cognitive gaps in the PIAAC

Adult cognitive gaps in the PIAAC

  • Post author:Emil O. W. Kirkegaard
  • Post published:15. October 2026
  • Post category:intelligence / IQ / cognitive ability

For fun, I posted some results for sex differences in cognitive tests from taketest.xyz on Twitter. Replotted, they look like this: Most tests show male advantages, and only 3 show…

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Read more about the article Interactions are generally not important in social science

Interactions are generally not important in social science

  • Post author:Emil O. W. Kirkegaard
  • Post published:3. October 2026
  • Post category:Differential psychology/psychometrics/Math/Statistics

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…

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Read more about the article Which country do you fit in?

Which country do you fit in?

  • Post author:Emil O. W. Kirkegaard
  • Post published:1. October 2026
  • Post category:Differential psychology/psychometrics/Sociology

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…

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Read more about the article Dimensions of the dating mind

Dimensions of the dating mind

  • Post author:Emil O. W. Kirkegaard
  • Post published:28. September 2026
  • Post category:Differential psychology/psychometrics

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…

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Read more about the article g-loadings of tests on taketest.xyz

g-loadings of tests on taketest.xyz

  • Post author:Emil O. W. Kirkegaard
  • Post published:27. September 2026
  • Post category:intelligence / IQ / cognitive ability

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.…

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Read more about the article Semen quality and intelligence

Semen quality and intelligence

  • Post author:Emil O. W. Kirkegaard
  • Post published:11. September 2026
  • Post category:intelligence / IQ / cognitive ability/Medicine

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…

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Read more about the article Explore psychological correlations at taketest.xyz

Explore psychological correlations at taketest.xyz

  • Post author:Emil O. W. Kirkegaard
  • Post published:11. September 2026
  • Post category:Differential psychology/psychometrics

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…

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Read more about the article Race differences in reaction time: data from NHANES 3

Race differences in reaction time: data from NHANES 3

  • Post author:Emil O. W. Kirkegaard
  • Post published:20. August 2026
  • Post category:intelligence / IQ / cognitive ability

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…

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Read more about the article Migrant performance on PISA worldwide

Migrant performance on PISA worldwide

  • Post author:Emil O. W. Kirkegaard
  • Post published:21. June 2026
  • Post category:Immigration/intelligence / IQ / cognitive ability

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…

Continue ReadingMigrant performance on PISA worldwide
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