Hi Statalisters,


Code:
clear
set seed 1234
set obs 200
gen id = _n
expand 3
sort id
bysort id: gen time = _n
gen x = runiform()<0.5
bysort id: gen trtx = x if _n==1
bysort id: egen trt = min(trtx)
drop x trtx
gen outcome = runiformint(20, 40)

Given the example data above, I have analysed the treatment effect as:

mixed outcome i.time##i.trt ||id: , reml nolog

However, a reviewer has requested and inclusion of baseline adjustment at time point 1 and I'm struggling with coding this. I will appreciate it if anyone can provide suggestions on how to code the data to adjust for baseline assessment at timepoint 1.

Thank you