Raymond cattell used factor analysis to reduce a huge list of personality traits compiled by gordon allport down to 16 basic dimensions of personality.
Factor analysis is a multivariate statistical technique for data reduction. This has been used widely in psychology because it helps to reduce a huge number of variables into latent variables.
Raymond Cattell was a British-American psychologist, who researched into interpersonal psychological structure. He reduced Allports list into 171 characteristics, this was further reduced to 16 key personality factors. He later developed an assessment based on this, which was called as 16PF Personality Questionnaire
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