07-13-2014 04:51 PM
I have a study that has a starting point of 1998. I also have the variable "event date" which consists of a number either +/- the starting point. I would like to convert this number into "year of event" to determine in what year after 1998 the event occurred. Is there a way to easily code this?
07-13-2014 05:35 PM
Use SAS date functions, shift the starting point date by event date days and get what year that is :
starting_point = '25OCT1998'd;
year = year(intnx("DAY", starting_point, event_date));
07-14-2014 04:47 AM
Whist the above two answers are completely correct, I am questioning what the question is. You state you have a starting point of 1998, which is fine. It is this event date variable which I am not sure on. Does this reference a time interval from the year or something else. I.e. does it contain days since 1998, years since then, quarters, or is it something completely adhoc such as category 2 indicates 5 years.