[R-meta] Metafor modeling question
Yuhang Hu
yh342 @end|ng |rom n@u@edu
Sun Mar 26 06:27:40 CEST 2023
Dear All,
I have two questions about the following model:
mm <- rma.mv(y ~ SES, V, random = list(~SES|study, ~SES|outcome), struct =
c("GEN","GEN"))
fit to a dataset structurally similar to:
study outcome SES
1 A 1.5
1 A 1.7
1 B 1.5
1 B 1.7
2 A 2.1
3 A 1.1
3 A 2.3
3 B 1.1
3 B 2.3
Question 1: I know, if I used: "random = list(~1 | study, ~1| outcome)",
then 'study' and 'outcome' would be crossed, random effects. But are
'study' and 'outcome' in model 'mm' still crossed,
random effects? (In other words, can crossed random-effects have varying
coefficients in them)
Question 2: Is it possible (or useful) to plot residuals vs. fitted values
for model 'mm'? If yes, how can we do that in metafor?
Many thanks for your help,
Yuhang
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