Primary Mental Abilities at collective and individual levels

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Scores in ability tests administered to approximately 2,780 4th-9th graders were decomposed into district, class, and individual components. Demographic characteristics of neighborhoods, self-selection between academic and general programs, emphasis in instruction, irregularities in test administration were used to explain the variation between schools and districts. First-order factor analyses at the individual level showed the usual Primary Mental Abilities test pattern. Second-order analyses grouped the primary factors into one Power and one Speed factor. This latter structure was found also in the analyses of class means, although the processes behind the factors were likely to be different from those operating at the individual level. (13 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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