I have a dataset with variables ID VISITNUM VISIT DATE,
I should write query in such a way that, for every id the difference between two successive visits should not be more than 6 weeks. If it is more than 6 weeks I should output those discrepancies. I am attaching sample data.
100010001 1 CYCLE 1 2014-09-15
100010001 2 CYCLE 2 2014-10-27
100010001 3 CYCLE 3 2014-11-27
100010002 1 CYCLE 1 2014-10-13
100010002 2 CYCLE 2 2014-11-24
100010003 1 CYCLE 1 2015-02-08
100010003 1 CYCLE 1 2015-04-08
100010004 1 CYCLE 1 2015-04-28
100020001 1 CYCLE 1 2014-12-04
100020001 2 CYCLE 2 2015-01-15
100020001 3 CYCLE 3 2015-03-02
100020001 4 CYCLE 4 2015-04-13
100020002 1 CYCLE 1 2015-03-18
100020002 2 CYCLE 2 2015-04-29
100030002 1 CYCLE 1 2014-11-03
100030002 2 CYCLE 2 2014-12-22
100030002 3 CYCLE 3 2015-02-09
100030002 4 CYCLE 4 2015-03-23
100030003 1 CYCLE 1 2015-05-04
140010004 1 CYCLE 1 2015-02-11
140010004 2 CYCLE 2 2015-03-27
data have;
input id $10. visit cycle $ date yymmdd10.;
format date yymmdd10. ;
cards;
100010001 1 CYCLE-1 2014-09-15
100010001 2 CYCLE-2 2014-10-27
100010001 3 CYCLE-3 2014-11-27
100010002 1 CYCLE-1 2014-10-13
100010002 2 CYCLE-2 2014-11-24
100010003 1 CYCLE-1 2015-02-08
100010003 1 CYCLE-1 2015-04-08
100010004 1 CYCLE-1 2015-04-28
100020001 1 CYCLE-1 2014-12-04
100020001 2 CYCLE-2 2015-01-15
100020001 3 CYCLE-3 2015-03-02
100020001 4 CYCLE-4 2015-04-13
100020002 1 CYCLE-1 2015-03-18
100020002 2 CYCLE-2 2015-04-29
100030002 1 CYCLE-1 2014-11-03
100030002 2 CYCLE-2 2014-12-22
100030002 3 CYCLE-3 2015-02-09
100030002 4 CYCLE-4 2015-03-23
100030003 1 CYCLE-1 2015-05-04
140010004 1 CYCLE-1 2015-02-11
140010004 2 CYCLE-2 2015-03-27
;
run;
proc sql;
select b.*,ifn(intck('week',a.date,b.date)>6,1,0) as flag from have a right join have b
on a.id=b.id and b.visit-a.visit=1 order by id,visit;
quit;
data have;
input id $10. visit cycle $ date yymmdd10.;
format date yymmdd10. ;
cards;
100010001 1 CYCLE-1 2014-09-15
100010001 2 CYCLE-2 2014-10-27
100010001 3 CYCLE-3 2014-11-27
100010002 1 CYCLE-1 2014-10-13
100010002 2 CYCLE-2 2014-11-24
100010003 1 CYCLE-1 2015-02-08
100010003 1 CYCLE-1 2015-04-08
100010004 1 CYCLE-1 2015-04-28
100020001 1 CYCLE-1 2014-12-04
100020001 2 CYCLE-2 2015-01-15
100020001 3 CYCLE-3 2015-03-02
100020001 4 CYCLE-4 2015-04-13
100020002 1 CYCLE-1 2015-03-18
100020002 2 CYCLE-2 2015-04-29
100030002 1 CYCLE-1 2014-11-03
100030002 2 CYCLE-2 2014-12-22
100030002 3 CYCLE-3 2015-02-09
100030002 4 CYCLE-4 2015-03-23
100030003 1 CYCLE-1 2015-05-04
140010004 1 CYCLE-1 2015-02-11
140010004 2 CYCLE-2 2015-03-27
;
run;
proc sql;
select b.*,ifn(intck('week',a.date,b.date)>6,1,0) as flag from have a right join have b
on a.id=b.id and b.visit-a.visit=1 order by id,visit;
quit;
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