NOTE: 2767319 observations were deleted due either to missing or invalid values for the entry, time, censoring, frequency, offset or explanatory variables or to invalid operations in generating the values for some of the explanatory variables. ERROR: There are no valid observations for the analysis. This is a different message than in your original post.   This message means, most likely, that you have a variable in the model for PROC PHREG that is always missing. Look at your data to see what is in there. ... View more

How am i supposed to create this age-variable? I have the birth -date variable which is the following;  bfoddat_SAS = input( put(X_bfoddat,8.), YYMMDD8.); Wow, this is confusing. You want the years (age) between this bfoddat_SAS variable and December 31, 2013? You have not stated that explicitly. Is that the question? Or have I misunderstood completely?   Side comment: there's really no point is adding _SAS to a variable name, every variable you use is a SAS variable. Save yourself some typing and save yourself the possibility of typographical errors by not adding _SAS to variable names. ... View more