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Guttman, Louis; Levy, Shlomit – Intelligence, 1991
Two structural laws for intelligence tests are discussed: one law concerns the sign of correlation coefficients and gives conditions under which all correlations between test items will be positive; and one law concerns the relative sizes of the correlation coefficients between intelligence items. A cylindrical structure extends these laws. (SLD)
Descriptors: Correlation, Foreign Countries, Intelligence Tests, Test Construction