The construction and utility of three indexes of intellectual achievement: an intellectual-development (ID) index a socio-intellectual-status (SIS) index a differential-intellectual-development (DID) index U.S. children and youths, 6-17 years.
D000124:Achievement; D000293:Adolescent; D002648:Child; D006801:Humans; D007361:Intelligence Tests; D012959:Socioeconomic Factors; D014481:United States