A battery of 57 specially constructed and marker tests was administered to 206 ninth-grade students. Sixteen divergent production abilities were predicted, along with 7 other reference factors in the structure of intellect. Principal components analysis was followed by orthogonal rotation according to Cliff's least squares procedure for approximating a target matrix. The 16 divergent-production factors and the 7 reference factors were clearly identified.
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Guilford et al. (1966) studied this question.