This runs right into the problem that Harvard ran into when they first switched away from exclusively tests - Goodhart's law applied by HBD Tests are a proxy for overall genetic quality as long as the context is humans who resulted from the same selective pressures
Let's imagine for a second that Harvard selected purely based on height but was located in a country populated entirely with a single ethnic group. Selecting for height is a pretty good proxy then for what H is looking for - overall genetic quality and ability to lead.
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Now introduce another group that was under intense selective pressure for height alone - members of this group break the invisible correlation that H was relying on. Test scores are and always were a proxy. They were a good proxy in a mono-ethnic nation. Now they're a bad proxy.
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This is on two levels - test scores are a proxy in the first place for intelligence and intelligence is a proxy for overall genetic quality and leadership ability.
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It was an ex of something that would work pretty well in a mono-ethnic state but breaks quite badly when you introduce human biodiversity. Reaction time was also considered indirectly - that's what athletic scholarships were about. Another, different group broke that correlation
End of conversation
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