Today most conclusions about cumulative knowledge in psychology are based on meta-analysis. We first present an examination of the important statistical differences between fixed-effects (FE) and random-effects (RE) models in meta-analysis and between two different RE procedures, due to Hedges...

A recently developed procedure produces substantial improvements in the accuracy of corrections for range restriction and reveals that predictive validities of employment selection methods are higher than previously thought. This study applied this procedure to meta-analytic validities of 2...

The common practice in meta-analyses and in individual studies of correcting for direct range restriction even though range restriction is actually indirect has long been known to lead to under-correction, but this error has been assumed to be small. Using validity generalization data sets for 4...

We respond to the three comments on our recent article in the August issue of Academy of Management Perspectives (Le, Oh, Shaffer, & Schmidt, 2007), which highlights the importance of methodological advances in human resource research. By concentrating on tangential aspects of our article, these...

Relations between constructs are estimated based on correlations between measures of constructs corrected for measurement error. This process assumes that the true scores on the measure are linearly related to construct scores, an assumption that may not hold. We examined the extent to which...

Recent research in the field of meta-analysis has provided a procedure of improved accuracy to correct for range restriction, which allows for more accurate calibrations of the validities of various admission and selection tools. For illustrative purposes, we reanalyzed the database...

The construct meaning of assessment center evaluations is an important unresolved issue in I/O psychology. This study hypothesized that Cognitive Ability and personality traits are primary correlates of evaluators' overall assessment ratings (OARs). Meta-analysis results based on 65 correlations...

There have been frequent expressions of concern over the supposed failure of researchers to conduct replication studies. But the large number of meta-analyses in our literatures shows that replication studies are in fact being conducted in most areas of research. Many who argue for replication...

Integrierte Versorgung ist einer der Schlagbegriffe, die momentan die gesundheitspolitische Debatte in Deutschland bewegen. In den letzten zwei Jahren wurden bereits über 2.000 verschiedene Verträge zwischen Krankenhäusern, Ärzten und Krankenkassen geschlossen, über die 4 Millionen...