[R-meta] mods~factor

[angelo solarino]

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

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