I have done a multi-level meta analysis with R, using metafor package. My questions relates to funnel plot asymmetry.
(1) If a regression test suggested funnel asymmetry (i.e. suggested a publication bias is present), Does this mean that my meta-analysis model is bad? and my results of meta-analysis are bad?
(2) What are other possible reasons, besides publication bias, that could lead to asymmetry in the funnel plots?