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lumberjack_jeff t1_j1zrlzf wrote

Well then yes. It stands to reason that a fourth grader will do better on most any test than a third grader.

Is that what they're studying?

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Vito_The_Magnificent t1_j1zvmdm wrote

No, they were studying if kids from rich families get more out of education than kids from poor families and if kids who are genetically predisposed to be smarter than average get more from schooling than kids who are predisposed to be dummer than average.

But to do that you have to seprate the effects of age from the effects of spending time in school.

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