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actual alternative forms applied approach assumptions attitudes attribute average correlation behavioral centroid Chap characteristic clusters concerning construct validity content validity correlation matrix correlations among items covariance criterion cross products developed diagonal spaces discriminant discussed distribution domain domain-sampling model employed estimate example experimenter factor analysis factor loadings formula frequently guessing Guttman scale highly human abilities hypothesized ICC theory important individual differences inferential statistics interval scale investigations linear combination logic mastery learning mathematical measurement error measures of personality multiple correlation number of factors number of items number of variables obtained scores particular personality traits possible predictive problem profiles psychological psychometric Q sort rank-order ratio scale regarding reliability sample self-inventories shown standard deviation standard scores statistical stimuli studies subjects Suggested Additional Readings tend tion total scores trace lines true scores types usually values variance vector weights zero