Abstract
Relatively pure factors. Measures of factors developed through the use of relationships among individual differences are not necessarily measures of factors is the same sense when they are used as dependent variables in experiments designed to determine the effect of an independent variable. Until a measure of a factor (developed from correlations among individual differences) has been empirically demonstrated to be a factor in an experimental sense (correlated mean changes), the construct validity of measures of factors must remain zero when the measures are used as dependent variables in experiments. Factor analytic procedures have produced tests which purport to measure.

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