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Statistical description of instruments and subjects
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16-year groups absolute zero Ad-test adjacent age groups Age Age group Age changes Anastasi AoB sample A2C arithmetic means Berglund Bl Ad Ns Bl-test calculated Chapter coefficients of constancy coefficients of correlation constancy of mental corresponding age groups course of growth cross-sectional and longitudinal Diff different age groups different tests Differential Psychology Equation IV:3a factor FIGURE VII formula Frequency distribution Gompertz curve growth curves homogeneity interval scale level intra-individual differences level of measurement linear relation longitudinal data mean intercorrelations mental ability mental growth normalized scores normally distributed Ns Bl Ns-test ability Number series obtained Op-test present investigation present study problem Psychol rank correlation Rank numbers raw score distributions reliability respect retest effect sample A2C sample sample Age Age sample Ns-testſ sample plotted scale values scaling method significant Sk group standard deviations subjects test ability testing sessions Thurstone Thurstone's method tions University of Uppsala variability