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ability administered alternative forms alternative-forms amount of fluctuation analysis analysis of variance Arithmetic test average behaviour Bennett-Slater between-occasion reliability borderline group calculated Cattell Cockett cognitive functions cognitive tests correction for attenuation criteria and indices criterion crude variability derived differential practice discrepancy errors of measurement evidence of fluctuation evidence of function experimental extent of fluctuation Eysenck factor analysis factor loadings Fiske and Rice formula function fluctuation Gulliksen's hypothesis hysteretic ibid indices of crude individual intercorrelations lack of invariance matrix mean method neurotic neuroticism non-cognitive functions Non-verbal Intelligence number of items parallel tests Paulsen performance personality pooling squares present writer Psychol psychological psychometric quotidian variability reliability coefficients retest scholarship group second experiment significant single-trial estimates Slocombe Spearman Spearman-Brown standard deviation standard error statistical subtests Table term test error test reliability test unreliability testing for evidence third experiment Thouless's time-interval tion uncorrelated variance variation Verbal Intelligence within-occasion Woodrow