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

if Last.aar then output;
/*output only the last of each BY group*/
data ud.lmdbmtx2;
set sumf;
by udtrnr;
/*constructing a dataset with all the persons taking
antidepressants and creating a new variable ’number of defined
daily dosages bought’*/
data test1;
set b.lmdbcollect;
KEEP apk atc ddd alder udtrnr aar;
proc sort data=test1;
by udtrnr aar;
data ud.lmdbN06A;
set test1;
where ATC like 'N06A%';
ADDK=APK*DDD;
/*summarising over the patients yearly consumption of
antidepressants in the variable antidep*/
data test1;
set b.lmdbN06A;
proc sort data=test1;
by udtrnr aar;
data sumf;
set test1;
by udtrnr aar;
/*BY statement creates First.udtrnr, Last.udtrnr, First.aar, and
Last.aar*/
if First.aar then antidep=0;
/*Set antidep to 0 when subgroup changes*/
antidep+ADDK;
/*Sum statement creates antidep, retains it, sets initial value to
0, and ignores missing
values of ADDK*/
if Last.aar then output;
/*output only the last of each BY group*/
data ud.lmdbN06A2;
set sumf;
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