An Analysis on Danish Micro Data - School of Economics and ...

data medold;
set b.lmdb_pct10_2003;
udtrnr=pnr;
proc sort data=medold;
by udtrnr;
DROP pnr;
data medold1;
merge medold (in=a) nyti (in=b);
by udtrnr;
if a;
if b;
/*Merging the old and new data by udtrnr*/
data allmedicin;
set medold1 collect2;
proc sort data=allmedicin;
by udtrnr;
/*The persons in the collected medicine-dataset get a year
attached based on date of purchase in order to merge the data with
the register data*/
data allmed;
set allmedicin;
dato=juldate7(eksd);
if 1995000