Beginning in the 1940s, Cattell used several techniques including the new statistical technique of common factor analysis applied to the English-language trait lexicon to elucidate the major underlying dimensions within the normal personality sphere.
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In order to measure trait constructs within the abnormal personality sphere, Cattell constructed the Clinical Analysis Questionnaire ( CAQ ) Part 1 of the CAQ measures the 16PF factors, While Part 2 measures an additional 12 abnormal ( psychopathological ) personality trait dimensions.
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