I have data that looks like this:
Patient ProgramDate FinanceDate
A 1/1/2012 2/3/2012
A 2/5/2012 4/6/2012
A . 5/25/2012
B 2/1/2012 4/1/2012
B . 4/5/2012
The data needs to look like this:
Patient VisitDates
A 1/1/2012
A 2/5/2012
A 4/6/2012
A 5/25/2012
B 2/1/2012
B 4/1/2012
B 4/5/2012
Basically I need the Finance Date to match up to a Program Date. No Finance Dates are allowed to Match up to the earliest ProgramDate. The finance date can be counted for in the Program Date if it occurs prior to a singular date. This is why Patient A does not have a VisitDate for 2/3/2012. This one is 'counted' twice and we only need to show one date.
data have;
input Patient $ ProgramDate: mmddyy10. FinanceDate: mmddyy10.;
cards;
A 1/1/2012 2/3/2012
A 2/5/2012 4/6/2012
A . 5/25/2012
B 2/1/2012 4/1/2012
B . 4/5/2012
;
run;
data want (keep=Patient VisitDate);
set have;
x=lag(FinanceDate);
rename ProgramDate=VisitDate;
if ProgramDate=. then do;
ProgramDate=x ;
output;
ProgramDate=FinanceDate;
output;
end;
else output;
run;
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