Hello everyone!
I have a country code year panel data. I want to create a duration variable (dur_regime) that starts when war starts (the first year war=1) and ends when the regime falls (gwf_fail=1). For the same country, multiple wars and multiple regime falls possible, however, if there are more than one war or regime fall war and gwf_fail are still coded as 1 (binary). Could you please let me know how do I create this variable?

Also, once I have created this variable, I would like to run a stcox regression in which failure (dur_regime==1) and main independent variable is alliance. Could someone please let me know how do I set the stset properly for this purpose?

Thanks a million!