[R-meta] unweighted analysis questions

[Alan Wilson]

Hey everyone - I have two questions regarding unweighted analyses.

1) Using the suggested code for unweighted analysis (rma(yi, vi, method="FE", data=dat, weighted=FALSE)) provides the same main effect but different 95% CIs when using the same or different vi values across studies.  I also found different 95% CIs when testing two different vi values (1 vs 100) that were the same across studies.  I also found that changing weighted=FALSE to weighted=TRUE provided same 95% CIs when using the same dataset.  Any idea what is causing the variation in 95% CIs?  What is best for unweighted analyses?

2) Any suggested approaches for publication bias checks for unweighted analyses?  I was thinking funnel plots of effect size and sample size.

Thanks for any advice.  alan

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