I would expect age at first birth to have a variance of literally zero
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and a zero mean too!!
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doesnt make any sense given the name of the variable
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ha we're selecting for tiredness
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i remember some of these correlations are actually smaller or reversed in the us (within race), presumably partly because of a smaller welfare state
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Exactly
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do they use medical records or rely on self-reported measures? most people are very young when they are born and so likely to misremember specifics
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