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Monthly Archives: April 2026

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Read more about the article Leftism, mental health, and visual presentation confirmed

Leftism, mental health, and visual presentation confirmed

  • Post author:Emil O. W. Kirkegaard
  • Post published:20. April 2026
  • Post category:Differential psychology/psychometrics

So we did another study of leftism, mental health and visual presentation: Hu, M.,& Kirkegaard, E. O. W.(2026). Left-wing ideology, mental health and body modifications. Journal of Open Inquiry in…

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Read more about the article Migration and feelings of safety in Denmark

Migration and feelings of safety in Denmark

  • Post author:Emil O. W. Kirkegaard
  • Post published:18. April 2026
  • Post category:Differential psychology/psychometrics/Immigration

A politician from the Social Democrats called Frederik Vad (center-left government party) posted results of a survey about how safe citizens report feeling in various areas of the country. There…

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Read more about the article The structure of Substack

The structure of Substack

  • Post author:Emil O. W. Kirkegaard
  • Post published:17. April 2026
  • Post category:Meta/Personal

So Substack has nice open APIs where one can download a lot of interesting data from. Uncorrelated already did some cool stuff on how to make money on Substack using…

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What really predicts fertility? A principled look at country time series data

  • Post author:Emil O. W. Kirkegaard
  • Post published:12. April 2026
  • Post category:Demographics

We have an endless amount of articles trying to show that this or that variable is a plausible causal candidate, and hopefully something we can do something about practically speaking.…

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Read more about the article American Jewish gentile differences

American Jewish gentile differences

  • Post author:Emil O. W. Kirkegaard
  • Post published:9. April 2026
  • Post category:intelligence / IQ / cognitive ability/Stereotypes

Jews are an extraordinarily successful ethnic group in almost everything they choose to engage in, from physics to politics with the curious exception of US presidencies. Seb Jensen compiled a…

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Read more about the article Who is gaining Danish citizenship?

Who is gaining Danish citizenship?

  • Post author:Emil O. W. Kirkegaard
  • Post published:6. April 2026
  • Post category:Demographics/Immigration

The Danish constitution says: §44 (1) No alien shall be naturalized except by statute. (2) The extent of the right of aliens to become owners of real property shall be…

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Assessment of the Confidence Calibration Test + new test

  • Post author:Emil O. W. Kirkegaard
  • Post published:4. April 2026
  • Post category:intelligence / IQ / cognitive ability

Yesterday, I posted a new cognitive test on taketest.xyz, the Confidence Calibration Test. If you want to take the test without biased results, take it now before reading further. You…

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Read more about the article Explaining Poland’s fertility paradox

Explaining Poland’s fertility paradox

  • Post author:Emil O. W. Kirkegaard
  • Post published:3. April 2026
  • Post category:Demographics

You have probably seen this map: It regularly goes viral on X with the usual abortion debate to follow. The source is this site, where we can also learn that this…

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Read more about the article Which countries are best at esports? 2026 update

Which countries are best at esports? 2026 update

  • Post author:Emil O. W. Kirkegaard
  • Post published:2. April 2026
  • Post category:intelligence / IQ / cognitive ability/Media studies

Given the ease of obtaining scraped datasets with Claude Code, I thought we could update my 2019 study of mental sports with the newest data and better methods. The primary…

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