Psychometric Theory

actual alternative forms applied approach assumptions attitudes attribute average correlation centroid Chap coefficient alpha computed concerning construct validity content validity correlation among items correlation matrix covariance covariance matrix criterion cross products developed discriminal discussed distribution domain domain-sampling model employed equal equation estimate example experimenter factor analysis factor loadings formula frequently guessing Guttman scale human abilities hypotheses ICC theory important independent variables individual differences inferential statistics interval scale investigations judgments linear combination logic mathematical measurement error ment multiple correlation normal distribution number of items obtained scores partial correlation particular personality traits possible predictive predictor problem psychometric Q sort rank-order ratio scale relationship responses rotation self-inventories shown square root standard deviation standard scores statistical stimuli studies subjects Suggested Additional Readings tend test items tion total scores trace lines true scores types usually values variance vectors weights zero