Data visit;
Input Subid Visitno Date: Date9. ;
Format Date Date9.;
Cards:
101 1 20jan2008
101 2 30jan2008
101 3 12feb2008
102 1 22jan2008
102 2 .
102 3 .
103 1 24jan2008
103 2 12feb2008
103 3 .
104 1 .
104 2 13feb2008
104 3 18feb2008
run;
Do you mean having two visits in a row missing (case 102), or all visits missing (you don't have a case for this).
Tom
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