THE EFFECT OF CORRELATED ARTIFACTS AND TRUE VALIDITY ON THE ACCURACY OF PARAMETER-ESTIMATION IN VALIDITY GENERALIZATION

The effect of non-zero intercorrelations among the three artifacts (cr iterion reliability, predictor reliability, and range restriction on t he predictor) and true validity on the accuracy of estimation in two v alidity generalization models (Model 1 and Model 2) was investigated. Only the Taylor Series Approximation 1 (TSA1) procedure from Model 1 a nd the procedure with complete sample-based artifact data from Model 2 were included in this study. Six intercorrelation conditions (zero, l ow positive, medium positive, low negative, low negative and positive, and medium negative and positive) and two distributions of artifacts were used in this investigation. The two major conclusions from this s tudy are: (a) Both models yielded reasonably accurate estimates of the mean of true validities (M rho) and (b) only Model 2 produced accurat e estimates of the variance of true validities (V rho) The need for ad ditional research for accurately estimating V rho when the three artif acts and true validity are correlated is recommended.