topic Sorting question in SAS Programming

Sorting question

buszhangsy — Wed, 03 Jun 2015 18:54:13 GMT

I want to sort prescription records by individual drug and the first service date and assign numbers to each drug based on sorting result but have no idea how to do that. An example is like this:

Patient ID Drug name Service date

0001 Drug A 01/01/2007

0001 Drug B 01/10/2007

0001 Drug C 01/20/2007

0001 Drug A 02/01/2007

0001 Drug B 02/10/2007

0001 Drug C 02/20/2007

0001 Drug A 03/01/2007

0001 Drug B 03/10/2007

0001 Drug C 03/20/2007

The desired outcome is like this,

Patient ID Drug name Service date Drug number

0001 Drug A 01/01/2007 1

0001 Drug A 02/01/2007 1

0001 Drug A 03/01/2007 1

0001 Drug B 01/10/2007 2

0001 Drug B 02/10/2007 2

0001 Drug B 03/10/2007 2

0001 Drug C 01/20/2007 3

0001 Drug C 02/20/2007 3

0001 Drug C 03/20/2007 3

Thanks!!!

Re: Sorting question

gergely_batho — Wed, 03 Jun 2015 19:06:26 GMT

proc sort data=have out=temp;

by Patient_ID Drug_name Service_date;

run;

data want;

set temp;

by Patient_ID Drug_name;

if first.Drug_name then do;

Drug_number+1;

end;

run;

Re: Sorting question

Steelers_In_DC — Wed, 03 Jun 2015 19:19:37 GMT

Here you go:

data have;

infile cards dsd;

informat service_date mmddyy10.;

format service_date mmddyy10.;

input Patient_ID $ Drug_name $ Service_date;

cards;

0001,Drug A,01/01/2007

0001,Drug B,01/10/2007

0001,Drug C,01/20/2007

0001,Drug A,02/01/2007

0001,Drug B,02/10/2007

0001,Drug C,02/20/2007

0001,Drug A,03/01/2007

0001,Drug B,03/10/2007

0001,Drug C,03/20/2007

;

proc sort data=have;by Patient_ID Drug_name;

data want;

set have;

by Patient_ID drug_name;

if first.Drug_name then drug_number +1;

run;