Question

I have an issue i am stuck on trying to sort out…i basically have a table that looks a little something like this..

ID    user    operation     date
1     Jon     In         01/01/2013
1     Paul    Out        02/01/2013
1     Paul    In         03/01/2013
2     Jon     Deleted    04/01/2013
2     Paul    In         05/01/2013
2     Jon     Out        06/01/2013
1     Jon     out        07/01/2013
1     Jon     Deleted    08/01/2013
2     Jon     out        09/01/2013 
1     Jon     in         11/01/2013

So basically i need to find where for the same ID both Jon and Paul are “In”. So in the example about Jon and Paul are both in for ID 1, and for ID 2 i will only find Paul. So the last known date for that row has to be included as the early in, out or deleted is it be ignored as it was later changed. So in short i need to find ID values where an IN existes and that has not been later set to “out” or Thanks in advance!

Answer 1

If you sort the data correctly then using first. in a data step should work (unless you have an id and user with more than 1 entry on the same day, you’d need to determine which one to take if that were the case).

data have;
input ID user $ operation $ date :mmddyy10.;
format date mmddyy10.;
cards;
1     Jon     In         01/01/2013
1     Paul    Out        02/01/2013
1     Paul    In         03/01/2013
2     Jon     Deleted    04/01/2013
2     Paul    In         05/01/2013
2     Jon     Out        06/01/2013
1     Jon     out        07/01/2013
1     Jon     Deleted    08/01/2013
2     Jon     out        09/01/2013 
1     Jon     in         11/01/2013
;
run;

proc sort data=have;
by id user descending date;
run;

data want;
set have;
by id user;
if first.user and lowcase(operation)='in' then output;
run;