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Perry versus NLSY79: Mean parental highest grade completed. Unrestricted NLSY79 is the full African-American subsample. Restricted NLSY79 is the African-American subsample limited to those satisfying the approximate Perry eligibility criteria: at least one elder sibling, Socioeconomic Status (SES) index at most 11, and 1979 AFQT score less than the African-American median. The reported “t” test is for the difference in means between the two populations.
