Are you looking brainstorming or careful analysis of their stats? Obv idea is that the combination of factors that make ppl good test-takers peaked, then declined
but they aren’t independent random draws bc not all families make a second draw - i think we both get the difficulty, hopefully someone will audit their econometrics and set me straight
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But I think what you're saying is something like this: You have three sets of parents: 80 IQ, 100, and 120. Each 80 set has 3 kids. Each 100 set has 2. Each 120 set has 1. Kid 1 minus kid 2 in the 100 set should still average to zero. Same for kids in the 80 set
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