Psychometric Theory

actual applied approach assumptions attitudes attribute average correlation centroid Chap clusters coefficient concerning construct validity content validity correlation matrix correlations among items covariance criterion cross products developed deviation scores dichotomous discriminal discussed distribution domain employed equal estimate example experimenter factor analysis factor loadings formula frequently guessing Guttman scale human abilities hypotheses ICC theory important individual differences inferential statistics interval scale investigations judgments linear combination logic mastery learning mathematical mean measurement error ML method multiple correlation number of items obtained scores ordinal scales orthogonal particular percent personality traits possible predictive previously problem psychological psychometric Q sort rank-order ratio scale relationship reliability responses rotated factors sample self-inventories shown speed standard deviation standard scores statistical stimuli studies subjects Suggested Additional Readings Table tend tion total scores trace lines true scores types usually values variables variance vectors weights zero