Hello all,

I'm trying to run network meta-analysis in Stata and I'm running into a problem that might be related to my data format. I was wondering if you could help me with the following:

I have my data in long format and some of my trials have more than one control group or more than one treatment group for a given vaccine. Example, code, and error message follows:

When I run the network setup command:
network setup number_sick number_animals, studyvar(Study) trtvar(vaccine_) or

I get the following error message:
variables Study vaccine_ do not uniquely identify the observations

Please let me know if you have any recommendations.?
Thank you,
Joaquin
Study number_animals number_sick vaccine_
1 48 20 Control
1 126 1 Control
1 305 23 Control
1 2809 309 Control
1 887 186 Control
1 48 16 A
1 126 1 A
1 305 11 A
1 2809 309 A
1 887 151 A
2 107 1 Control
2 107 1 B
2 107 4 B
2 107 1 B
3 103 42 Control
3 51 16 Control
3 50 15 Control
3 49 11 A
3 48 16 A