Hi all,

I'm do a controlled interrupted time series analysis on Stata 15.1.

I have five years of panel data (2014-2018), and my subjects are health clinics. I have c.500 clinics in my treatment group, and c.7000 clinics in my control group. The intervention happened in 2017.

I've tried using the 'ista' command; but that only allows one treatment group (i.e. one clinic), like so:
Code:
itsa Dependent_var, treat(1) trperiod(2017) lag(1) posttr figure
I want to have all 500 treatment clinics in the treatment group. Is this possible?

Many thanks.