I would like to create a flag if there are instances for "acute" locations more than once
group | index | location |
1 | 1 | Home |
1 | 2 | Acute |
1 | 3 | Rehab |
1 | 4 | Home |
1 | 5 | Acute |
2 | 1 | Acute |
2 | 2 | Home |
2 | 3 | Rehab |
3 | 1 | Home |
3 | 2 | Rehab |
3 | 3 | Home |
4 | 1 | Home |
4 | 2 | Acute |
4 | 3 | Home |
4 | 4 | Acute |
4 | 5 | Rehab |
Want:
group | index | location | rehospitalization |
1 | 1 | Home | 0 |
1 | 2 | Acute | 0 |
1 | 3 | Rehab | 0 |
1 | 4 | Home | 0 |
1 | 5 | Acute | 1 |
2 | 1 | Acute | 0 |
2 | 2 | Home | 0 |
2 | 3 | Rehab | 0 |
3 | 1 | Home | 0 |
3 | 2 | Rehab | 0 |
3 | 3 | Home | 0 |
4 | 1 | Home | 0 |
4 | 2 | Acute | 0 |
4 | 3 | Home | 0 |
4 | 4 | Acute | 1 |
4 | 5 | Rehab | 0 |
or
group | rehospitalization |
1 | 1 |
2 | 0 |
3 | 0 |
4 | 1 |
What I have done so far is this:
proc sql;
create table test2 as
select distinct group, location, (*) as total_revisits
from test;
quit;
data test2; set test2;
if total_revisits >= 2 then rehopsitalization = 1
;run;
i was wondering if there was a simple way
data have; input group index location $; datalines; 1 1 Home 1 2 Acute 1 3 Rehab 1 4 Home 1 5 Acute 1 6 Rehab 1 7 Home 1 8 Acute 2 1 Acute 2 2 Home 2 3 Rehab 3 1 Home 3 2 Rehab 3 3 Home 4 1 Home 4 2 Acute 4 3 Home 4 4 Acute 4 5 Rehab ; proc sql; create table want as select group,sum(location='Acute')>1 as rehospitalization from have group by group; quit;
Use a RETAINed variable in a data step:
data have;
input group index location $;
datalines;
1 1 Home
1 2 Acute
1 3 Rehab
1 4 Home
1 5 Acute
2 1 Acute
2 2 Home
2 3 Rehab
3 1 Home
3 2 Rehab
3 3 Home
4 1 Home
4 2 Acute
4 3 Home
4 4 Acute
4 5 Rehab
;
data want;
set have;
by group;
retain has_acute;
if first.group then has_acute = 0;
rehospitalization = 0;
if location = "Acute"
then do;
if has_acute
then rehospitalization = 1;
has_acute = 1;
end;
drop has_acute;
run;
A minor variation on @Kurt_Bremser's solution.
Example data includes an example with a third "Acute" to see if the result is as needed in that case.
data have; input group index location $; datalines; 1 1 Home 1 2 Acute 1 3 Rehab 1 4 Home 1 5 Acute 1 6 Rehab 1 7 Home 1 8 Acute 2 1 Acute 2 2 Home 2 3 Rehab 3 1 Home 3 2 Rehab 3 3 Home 4 1 Home 4 2 Acute 4 3 Home 4 4 Acute 4 5 Rehab ; data want; set have; by group; retain acutecount; if first.group then acutecount=0; if location='Acute' then acutecount+1; Flag= (location ='Acute' and acutecount>1); drop acutecount; run;
SAS returns a numeric 1 for a true comparison and 0 for false. So the Flag= statement is just another way to do a sort of if <condition> then value=1; else value=0;
data have; input group index location $; datalines; 1 1 Home 1 2 Acute 1 3 Rehab 1 4 Home 1 5 Acute 1 6 Rehab 1 7 Home 1 8 Acute 2 1 Acute 2 2 Home 2 3 Rehab 3 1 Home 3 2 Rehab 3 3 Home 4 1 Home 4 2 Acute 4 3 Home 4 4 Acute 4 5 Rehab ; proc sql; create table want as select group,sum(location='Acute')>1 as rehospitalization from have group by group; quit;
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