I'm surprised by this recent Norway IQ study. Before 1975, later born children within a family scored higher. After, later born children scored lower. Unless I'm missing something, dysgenics shouldn't play a role here. What happened?
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Here's a possibility: smarter siblings increasingly avoided taking these tests in the cohort that was born after 1975?
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Random effect? Regression to mean?
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No, looks like something in the environment (nutrition? older parents?) or some kind of sampling change.
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post finished, and just checking it again, but the suppositions you have been considering cannot be identified by this study. All it has done is rule out immigration and dysgenics.
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Do you know why migration is included as a potential environmental factor? Seems to me that it could only act on the environment via the other mechanisms.pic.twitter.com/XBghTMJOrJ
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It is a confounder, usually because immigrants are overall of lower ability against European norms.
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Any comment on intelligence of your policy makers who allow that kind of immigration? Understandably I don't mean immigration of doctors, scientists or software professionals.
End of conversation
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