id rx1 rx_date h_date
1 a 1/1/2005 1/20/2005
1 b 2/2/2005
1 c 3/3/2005
2 a 1/2/2003 1/12/2003
2 a 2/2/2003
2 a 4/4/2003
3 b 1/2/2005 1/18/2005
3 c 2/3/2005
3 b 3/4/2005
I have a data similar to this. Patients can have multiple drug therapy rx1 in the same rx_Date or in different rx_date, I wanted to assess the patterns of change. For example I wanted to know how many patients switched one drug to another after h_date. Patient 1 was on a then after h_Date switched to b, patient 2 was on a and cont on a after h_Date.
OK. There is only one h_Date for each patient.
data have;
input id rx1 $ (rx_date h_date) (: mmddyy10.);
format rx_date h_date mmddyy10.;
cards;
1 a 1/1/2005 1/20/2005
1 b 2/2/2005 .
1 c 3/3/2005 .
2 a 1/2/2003 1/12/2003
2 a 2/2/2003 .
2 a 4/4/2003 .
3 b 1/2/2005 1/18/2005
3 c 2/3/2005 .
3 b 3/4/2005 .
;
run;
data temp;
set have(keep=id rx1 rx_date )
have(keep=id rx1 h_date rename=(h_date=rx_date) where=(rx_date is not missing) in=inb);
by id rx_date ;
if inb=0 and lag(inb)=1 or first.id;
run;
proc sql;
select *
from temp
group by id
having count(distinct rx1) gt 1
order by id,rx_date ;
quit;
Your data is not completed . There are lots of missing value .
And what output do you want ?
There is only 1 h_date per patient. I want the proprtion of patient who change rx1 (in a time period of 30 days) after h_date
proprtion of those who remain on a after h_date (patient 2), those who change from a to b (patient a) and so on.
OK. There is only one h_Date for each patient.
data have;
input id rx1 $ (rx_date h_date) (: mmddyy10.);
format rx_date h_date mmddyy10.;
cards;
1 a 1/1/2005 1/20/2005
1 b 2/2/2005 .
1 c 3/3/2005 .
2 a 1/2/2003 1/12/2003
2 a 2/2/2003 .
2 a 4/4/2003 .
3 b 1/2/2005 1/18/2005
3 c 2/3/2005 .
3 b 3/4/2005 .
;
run;
data temp;
set have(keep=id rx1 rx_date )
have(keep=id rx1 h_date rename=(h_date=rx_date) where=(rx_date is not missing) in=inb);
by id rx_date ;
if inb=0 and lag(inb)=1 or first.id;
run;
proc sql;
select *
from temp
group by id
having count(distinct rx1) gt 1
order by id,rx_date ;
quit;
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