Hi,
data have;
input id date ;
datalines;
id date
1 01/01/2016
1 01/14/2016
1 01/22/2016
2 02/03/2016
2 04/03/2016
run;
I want to extract week from the first date for the id (observation) and add the same value to others even if the others are different eg
Data want
id data week
1 01/01/2016 1
1 01/14/2016 1
1 01/22/2016 1
2 02/08/2016 2
2 04/25/2016 2
Thank you
data have;
input id date mmddyy10. ;
cards;
1 01/01/2016
1 01/14/2016
1 01/22/2016
2 02/16/2016
2 04/03/2016
;
run;
proc sort data=have;
by id date;
run;
data want ;
set have;
by id;
retain week;
if first.id then week=intck('week',intnx('month',date,0),date)+1;
run;
data have;
input id date mmddyy10. ;
cards;
1 01/01/2016
1 01/14/2016
1 01/22/2016
2 02/16/2016
2 04/03/2016
;
run;
proc sort data=have;
by id date;
run;
data want ;
set have;
by id;
retain week;
if first.id then week=intck('week',intnx('month',date,0),date)+1;
run;
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