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I think I had it backwards! That worked out fantastic. Thank you so very much!!

Thanks very much for your reply. Apologies if I did not understand or follow your instructions correctly, but unfortunately this resulted in a continuous number of sequences for the new variable. What I am hoping to have happen is that within each subject (subjid), the time variable (visdy) to be ...

Hello all and thank you in advance for any advice.

I have a continuous time variable ('visdy', +/- 0, representing days from 'baseline' intake in a longitudinal study). Generally, participants were re-tested annually but there may be substantial variation of precise testing time.

I want to compute ...