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.
2.
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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