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polymathwannabe comments on Open thread, Sep. 21 - Sep. 27, 2015 - Less Wrong Discussion
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How do you handle a scenario where the causal arrow goes both ways, i.e. intelligence drives employability and wealth, while nutrition and prenatal care drive intelligence?
You might handle it with a longitudinal SEM or causal net since you have time separating effects (parental intelligence comes before wealth which comes before nutrition/prenatal-care which comes before childrens' intelligence); but for that specific case, nutrition & prenatal care are already largely ruled out as causally relevant since they fall under 'shared environment', which for IQ in the West is very low.