Statistician's comment
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EDITOR,—The idea of the “fail safe N” is to some degree sound, but there are two problems with it as an approach to the issue of publication bias. Firstly, it is a crude method for testing whether a significant result of meta-analysis can be made not significant by the addition of N studies that have an average null effect. This overemphasises the importance of statistical significance, which …
[1] L. Hedges,et al. The Handbook of Research Synthesis , 1995 .