I need to create a new variable based on care interruption. RICF represents how many years from the event of interest. So ricf1=1 year since event, ricf2=2 years since event, ricf3=3 years since event, etc; I want to create a variable that states how many years till the first interruption (YTI) which are circled in red. So for example obs    YTI 1        0 2        2 3        0 4        0 5        10 6        5 7        0  8        3 9        9 10      1  ... View more