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The NLSY doesn't include a test of IQ. It includes an AFQT test. That stands for Armed Forces Qualification Test. The NLSY tracks young people who are between 14-22 in 1979 through time. Therefore, they take the AFQT test when they are at least 14 and often older. The AFQT test isn't designed to measure intelligence per se. Your argument is pretty much that students who score well on standardized tests in high school and college are much more likely to graduate (or to have graduated) from high school. There are all sorts of correlation/causation problems there.

The AFQT test isn't designed to measure intelligence per se.

Yes, but as the source explains, the AFQT has several sub-tests, and most of them are highly correlated to IQ. (A few, like the automotive knowledge test, are uncorrelated with IQ.) They claim that appropriate analysis of results on the sub-tests allows a reasonably accurate measurement of IQ to be made.

EDIT: Re-checking the source, they mention that in 1989 the armed forces rescored the AFQT to make it more g-loaded and repeatable. The first draft of the book used the 1980 scoring, but they redid it all using the 1989 scoring because it was superior.

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