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Really? I assume on average of W2 wage earners?
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Not specifically. If you give a bunch of kids IQ tests, those results will predict their future earnings better than the other stuff you know about them.
It's still a noisy predictor, though.
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Understand now IQ test versus something like math scores?
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Some math tests are essentially IQ tests
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The best predictor of income is IQ and IQ is heritable.
Yes, its not "the sole predictor", but of the different variables its the best single variable to choose (if you must choose just one variable).
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We should graph student sat scores vs parents sat score
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The data isn’t readily available
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My recollection is that SAT tutoring is only worth a few points which wouldn’t even register on this chart.
The best predictor of income is IQ and IQ is heritable.