A couple of questions:
- does subject play any role in the calculations or analysis? If so, how?
- can start date and end date be different?
If you answer YES to any of these, can you provide a more realistic example of the data?
Also: when you say "Because the date is not a consecutive date" what date are you referring to, start date or enddate?
Also: can you please provide working SAS code to read in your example data into a SAS data set?
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Paige Miller