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by colechristensen
1000 days ago
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IQ is a mediocre-at-best metric for intelligence. "Intelligence" is probably real and variable among people, but poorly defined, very hard to test, and subject to a whole lot of opinion. IQ is bad at comparing people from different backgrounds, especially across cultures, languages, etc. But IQ can be a valid comparison for a single non-cultural variable. i.e. lead exposure in otherwise identical cohorts. |
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You could do this stratification/matching for any IQ study. What's special about lead-IQ?