[R-meta] mods~factor

-----Original Message-----
From: R-sig-meta-analysis [mailto:r-sig-meta-analysis-bounces at r-project.org] On
Behalf Of angelo solarino
Sent: Tuesday, 29 June, 2021 12:21
To: r-sig-meta-analysis at r-project.org
Subject: [R-meta] mods~factor

DA,

I am having some trouble with the "factor" command in metafor.
I am not able to get the split for the variable field. it is a string
value. whether i add "mods~factor(field)"  or not I get the same main
effect results, and there is no error message. Can anyone help me figure
out what I am doing wrong?

res <- rma(yi,vi, mods~factor(field), data=Outcomes1, method = "HS",
subset=(ID=="XX" | ID=="XY"))

Thanks a lot for your help,
Angelo