Differences

This shows you the differences between two versions of the page.

--- tips:weights_in_rma.mv_models [2021/11/08 15:17] – Wolfgang Viechtbauer
+++ tips:weights_in_rma.mv_models [2021/12/20 15:46] – Wolfgang Viechtbauer
@@ Line 1: / Line 1: @@
 ===== Weights in Models Fitted with the rma.mv() Function =====
-One of the fundamental concepts underlying a meta-analysis is the idea of weighting: More precise estimates are given more weight in the analysis then less precise estimates. In 'standard' fixed- and random-effects models (such as those that can be fitted with the ''rma()'' function), the weighting scheme is quite simple and covered in standard textbooks on meta-analysis. However, in more complex models (such as those that can be fitted with the ''rma.mv()'' function), the way estimates are weighted is more complex. Here, I will discuss some of those intricacies.
+One of the fundamental concepts underlying a meta-analysis is the idea of weighting: More precise estimates are given more weight in the analysis then less precise estimates. In 'standard' equal- and random-effects models (such as those that can be fitted with the ''rma()'' function), the weighting scheme is quite simple and covered in standard textbooks on meta-analysis. However, in more complex models (such as those that can be fitted with the ''rma.mv()'' function), the way estimates are weighted is more complex. Here, I will discuss some of those intricacies.
 ==== Models Fitted with the rma() Function ====
@@ Line 33: / Line 33: @@
 Variable ''yi'' contains the log risk ratios and variable ''vi'' the corresponding sampling variances.
-We now fit fixed- and random-effects models to these estimates.
+We now fit equal- and random-effects models to these estimates.
 <code rsplus>
@@ Line 54: / Line 54: @@
        at=log(c(1/16, 1/4, 1, 4, 8)), digits=c(2L,4L), ilab=w.ee.re, ilab.xpos=c(-6,-4))
 abline(h=0)
-addpoly(res.ee, row=-1, atransf=exp)
+addpoly(res.ee, row=-1)
-addpoly(res.re, row=-2, atransf=exp)
+addpoly(res.re, row=-2)
 text(-6, 15, "EE Model", font=2)
 text(-4, 15, "RE Model", font=2)