topic Compare a variable with a subset of the same variable in SAS Programming

Compare a variable with a subset of the same variable

jeka1212 — Wed, 05 Sep 2018 21:24:24 GMT

Hello all,

II need to compare a variable (y1) to a subset of the same variable (y2) to generate a binary variable (beta). is there a clever way of doing this without having missing data?

Many thanks,

y1	y2
28	28
15.5	15.5
8.2	8.2
3.4	3.4
17.3	17.3
15.2	15.2
32.9	32.9
11.1	11.1
87.5
16.2
107.9
5.7
25.6
31.2
21.6
55.6
8.8
6.5
22.1
14.4
44.2
3.7
7.8
8.9
719
2106.667
24000
1715
3.6
521.5
1600
454
109.7

proc sql;
create table temp as
select
a.y1 as compare_y1,
b.y2 as compare_y2,
a.y1 <= b.y2 as beta
from training as a, training as b;
quit;

data training;
 input y1 y2;
     datalines; 
28	28
15.5	15.5
8.2	8.2
3.4	3.4
17.3	17.3
15.2	15.2
32.9	32.9
11.1	11.1
87.5	
16.2	
107.9	
5.7	
25.6	
31.2	
21.6	
55.6	
8.8	
6.5	
22.1	
14.4	
44.2	
3.7	
7.8	
8.9	
719	
2106.667	
24000	
1715	
3.6	
521.5	
1600	
454	
109.7
;
run;	


proc sql;
create table temp as
select 
    a.y1 as compare_y1,
    b.y2 as compare_y2,
    a.y1 <= b.y2 as beta
from training as a, training as b;
quit;

Re: Compare a variable with a subset of the same variable

novinosrin — Wed, 05 Sep 2018 21:38:15 GMT

Are you after this?

data want;
set training(drop=y1 where=(y2 ne .)) ;
do n=1 to nobs;
set training(drop=y2) point=n nobs=nobs;
beta=y1 <= y2;
output;
end;
run;

Re: Compare a variable with a subset of the same variable

ChrisNZ — Wed, 05 Sep 2018 22:32:35 GMT

Like this?

proc sql;
create table temp as
select 
     a.y1 as compare_y1
   , b.y2 as compare_y2
   , a.y1 <= b.y2 as beta
from (select unique y1 from training where y1 ne .) as a
   , (select unique y2 from training where y2 ne .) as b;
quit;

Re: Compare a variable with a subset of the same variable

jeka1212 — Thu, 06 Sep 2018 01:26:02 GMT

Yes indeed this what I wanted . Many thanks novinosrin for your time

Re: Compare a variable with a subset of the same variable

jeka1212 — Thu, 06 Sep 2018 01:30:28 GMT

Many thanks ChrisNZ. This is correct too