Meta-analysis and moderator variables: a cautionary note on transportability

Article Abstract:

Despite the recent popularity of meta-analysis as a tool for summarizing empirical results across a number of studies, surprisingly little research has been conducted on the accuracy of these procedures under a variety of conditions. Of concern in this study was the 90% credibility value (Pearlman Schmidt, & Hunter, 1980) advocated as a rule of thumb regarding the transportability of employment test validities. We investigated the ability of this meta-analytic rule to detect the presence of discretely defined moderator variables, that is, the ability of the rule to detect instances where transportability is inappropriate. An infinite sample size analysis and a mathematical proof demonstrated that the transportability rule may produce erroneous inferences at rates higher than expected. (Reprinted by permission of the publisher.)

Meta-analysis, Employment tests

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The power of the Schmidt and Hunter Additive Model of Validity Generalization

Article Abstract:

Monte Carlo simulation and infinite sample-size analysis were used to test inferences based on the Schmidt and Hunter Additive Model of Validity Generalization when rho in some instances was zero. Results of both large (n = 1,000) and small (n less than 100) sample simulations, and corroborating evidence from infinite sample-size analysis, suggest that when rho is zero in upward of 30 percent of the cases (and rho is .6 for the remaining cases), the Schmidt and Hunter procedure could prompt erroneous inferences of generalizability. (Reprinted by permission of the publisher.)

Methods, Mathematical models, Statistical sampling, Sampling (Statistics), Analysis of variance, Psychological research

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Correction for variance restriction in pont-biserial correlations

Article Abstract:

A correction procedure is proposed for adjusting point-biserial correlations for attenuation produced by inopportune splits in the dichotomous variable. The correction procedure permits estimation of the point-biserial correlation that would have been seen had equal proportions been present. Monte Carlo simulation evidence is provided for the accuracy of the correction procedure. Also, an example is provided from the employee turnover literature to illustrate how the correction procedure may be used. (Reprinted by permission of the publisher.)

Estimation theory

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