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Adjusting for Publication Bias in Meta-Analysis: An Evaluation of Selection Methods and Some Cautionary Notes

Published on Sep 1, 2016in Perspectives on Psychological Science8.19
· DOI :10.1177/1745691616662243
Blakeley B. McShane16
Estimated H-index: 16
(NU: Northwestern University),
Ulf Böckenholt32
Estimated H-index: 32
(NU: Northwestern University),
Karsten T. Hansen15
Estimated H-index: 15
(UCSD: University of California, San Diego)
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Abstract
We review and evaluate selection methods, a prominent class of techniques first proposed by Hedges (1984) that assess and adjust for publication bias in meta-analysis, via an extensive simulation study. Our simulation covers both restrictive settings as well as more realistic settings and proceeds across multiple metrics that assess different aspects of model performance. This evaluation is timely in light of two recently proposed approaches, the so-called p-curve and p-uniform approaches, that can be viewed as alternative implementations of the original Hedges selection method approach. We find that the p-curve and p-uniform approaches perform reasonably well but not as well as the original Hedges approach in the restrictive setting for which all three were designed. We also find they perform poorly in more realistic settings, whereas variants of the Hedges approach perform well. We conclude by urging caution in the application of selection methods: Given the idealistic model assumptions underlying selec...
  • References (43)
  • Citations (63)
References43
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