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Dear all, Although this topic has been discussed several times and I read the archives and referenced papers, I?m still not sure how to assess and possibly correct for selection bias in multivariate meta-analyses. I used the metafor...

Dear Wolfgang & James, Many thanks for your helpful answers and thoughts! I had indeed read the papers you mentioned, but I hadn't come across the metaselection package yet. I will try it out and get back to you if...

Dear Wolfgang, Many thanks for pointing that out! That was indeed not what I had intended, and the change has solved the problem. Best, Pia On Mi, 4 Sep 2024 14:03:39 +0000 Viechtbauer, Wolfgang (NP) <wolfgang.viechtbauer at...

Dear James, thank you so much for your detailed reply. In fact, the negative effect size does not represent an improvement but a deterioration. However, I would still need to change the code for fitting the model as the problem...

Dear Wolfgang, dear all, thank you very much for your reply, Wolfgang! I would like to summarise whether I have understood your explanations correctly and would be very grateful for your feedback: If I understand you correctly according to your...

Dear all, I would be very grateful if you could help me clarify my calculations. I am conducting a meta-analysis using metafor and want to calculate Hedges g av (see Lakens, 2013 - doi: 10.3389/fpsyg.2013.00863). [background...

Dear James & Wolfgang, dear all, I have tried the metaselection package for some of my meta-analyses and would be very grateful if you could have a look at the results to see if it looks plausible to you? James...

Dear all, although this issue has been raised recently (see below), I would highly appreciate your advice, particularly regarding whether I might use nearPD to approximate a PD V matrix. I am running a meta-analysis with 30 studies, 11...