Funnel Plot Asymmetry Is Not Proof of Publication Bias
Egger's test detects small-study effects, which have several causes. How to run it, when it is uninformative, and what to claim from the result.
Fig. 1: the same asymmetry, three causes
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Egger's test detects small-study effects, which have several causes. How to run it, when it is uninformative, and what to claim from the result.