The following is from the help for metabias:

metabias varlist [if exp] [in range]

[, egger peters harbord begg graph nofit or rr level(#) z(newvar) v(newvar) graph_options ]

by ... : may be used with metabias; see help by.

I see no by option for metabias. Rather, it appears that you have to do something like this:

sort treatment

by treatment: metabias logrr selogrr, egger

by treatment: metabias logrr selogrr, begg

Dear Bruce,

Thank you very much, it works

Bruce Weaver

I used this code for egger's test: by treatment: metabias loghr seloghr, egger , it works properly. I used this code for begg's test: by treatment: metabias loghr seloghr, begg , but it works only in one subgroup and for the rest of them I get this error: invalid syntax r(198). can you please help me with this issue?

Jalal Choupani, I have never used -metabias-. You might have better luck posting your question to Statalist (https://www.statalist.org/forums/forum/general-stata-discussion/general). Before posting, take a look at the good advice in the FAQ about how to include some data so that others can duplicate the problem, etc. HTH.\

Dear Bruce Weaver

I already did that, anyway, thank you for your help

For those who are interested, the Statalist thread can be viewed here:

• https://www.statalist.org/forums/forum/general-stata-discussion/general/1510574-invalid-syntax-r-198