So in my study I have 4 participant groups, each has undergone treatment I am I looking for changes in the variable across time-points, but I am only interested in 2 of these groups. I need to discern between treatment responders and non-responders in these measures to see significant changes in variables in only the responders. Responders and non-responders have already been established.
I've thought about using the syntax of:
select if (study_group=1 or study_group=2 and Wk6_responder=1) .... in addition to the other commands
However I believe that this will only attribute the "responder" criteria to group 2 ... is this correct? If so, what would a better command line be?