Occupations, fertility, men, and politics
In response to my prior post on the fertility rates of American women by occupation, some asked for the results for men, and others pointed out that there seems to…
Tracking ancestry and social inequality using American surnames
Our big project was finally published: Van Pelt, D., & Kirkegaard, E. O. (2026). Big Data, Deep Roots: Correlating Surname Genetic Ancestry and Socioeconomic Status across Millions of Americans. Comparative…
Race and social inequality in France
France is the 4th most populous country in Europe these days (it used to be number 1 before it had early secularization). It is also quite insular when it comes…
What really predicts fertility? A principled look at country time series data
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.…
Who is gaining Danish citizenship?
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…
Explaining Poland’s fertility paradox
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…
Consequences of racial composition changes in USA 1970-2023
Some years ago, I gave a good idea of a study to a friend, and he did it. But then he just never published his study anywhere, it's just sitting…
Dysgenics for whom?
Some time ago, we published studies showing that the negative correlation between intelligence and fertility varies by other factors. Specifically, we found that it varies by religiousness and conservatism, in…
Are dogs good or bad for fertility?
In August last year, I wrote a post about our then new study about people's pet preferences and various human differences: Prior research found that pet preferences and ownership relates…
Government family spending does not predict fertility rates, or does it
Fertility rates are terrible in every good country except for Israel. Why is that? Well, maybe we just don't spend enough money on this. Maybe it is too expensive to…