Emil Kirkegaard Profile picture
Aug 14, 2023 4 tweets 2 min read Read on X
Private market fans are usually a fan of private education. The trouble is that educational outcomes are mostly just genetics, so there isn't much room for improvement. One way to study this is to look at school voucher randomized trials.

This meta-analysis shows that they don't do anything for reading or math ability in the West. The results for non-Western countries are larger, but not very trustworthy due to rampant scientific misconduct in those countries. Shrug tier.

Private education probably preferable on other grounds, but not for actual learning outcomes.

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The Participant Effects of Private School Vouchers Across the Globe: A Meta-Analytic and Systematic Review

papers.ssrn.com/sol3/papers.cf…
Reminders about rampant scientific dishonesty outside the West.

emilkirkegaard.com/p/scientific-m…
Randomized trials from outside the West very often have fraudulent or impossible data.

…-publications.onlinelibrary.wiley.com/doi/abs/10.111…

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More from @KirkegaardEmil

Apr 12
US Naval Academy: "a white applicant with a 5% chance of admission would have a 50% chance if evaluated as Black, and more than 70% of Black admits would not have been admitted under a race-neutral system"

Whites the most systematically discriminated against race. Image
The usual SAT gaps among applicants. Image
US military looks like other publicly funded institutions. A jobs program for non-Whites. Image
Read 4 tweets
Apr 4
Americans are super fat, so many people look for explanations for this, usually something USA-specific like seed oils, or corn syrup. Image
Americans have some race differences too, but they aren't that large. The White Americans are quite fat by themselves, only Asians drag the mean down. Image
Maybe it's due to money. Americans are rich. Yes, but the plot worldwide looks like this. There's just about no relationship between median income (or GDPpc) after covering basic necessities. Image
Read 10 tweets
Mar 14
Soyboyism is also heritable. In fact, the most heritable (snp h²) dietary habit in this study! (bottom right) Image
Read 4 tweets
Mar 8
Can Europe learn from Ghana? Buried on Wikipedia is a 3 sentence part about how Ghana deported 20% of the population -- 3 million people -- all the non-Ghanans. And it only took 3 months. The "Ghana Aliens Compliance Order" (GACO)

en.wikipedia.org/wiki/Illegal_i…Image
This website provides the history. It begins, of course, with economic migration since Ghana was the gold coast. In fact, these migrants were going into a British colony, probably for the usual reasons of wanting to live under European domain: rule of lawand prosperity. Image
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European rule eventually declined, and just after they left (1957), the economy goes bad. At least, so they say, but it doesn't look that way until 1970s by GDP stats. Image
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Read 8 tweets
Jan 20
The racism of teachers Image
In Germany, non-German students (anyone with "migration background") get lower grades and test scores. Image
Due to their politics, teachers are expected to have some bias towards girls, minorities, low-SES etc. students. So do they? The authors find that, yes, they do. Image
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Read 6 tweets
Jan 11
The decline of intelligence, as measured by genetic scores. Image
The decline of intelligence estimated by fertility and intelligence correlations by country. Image
The decline of human average intelligence to come, as seen by the fertility rates and national IQs. Image
Read 5 tweets

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