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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Says that they "use a Bayesian model to estimate and correct for selection into scoring". I would guess that this means they are weighting the data by estimated participation rate. People who I respect are taking it seriously so I'm assuming it's a valid approach.
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