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somebody
Lapis Lazuli | Level 10

I would like to remove observations where the value in 2 columns are the same (exists before). For example, pair A and B exist already so I would like to remove the fourth observation. similarly, I would like to remove the last obs as the pair B and C already exist.

student1student2treatment
ABkeep
ACkeep
ADkeep
BAremove
BCkeep
BDkeep
CAkeep
CBremove

 

1 ACCEPTED SOLUTION

Accepted Solutions
s_lassen
Meteorite | Level 14

If you can live with an arbitrary order of your students in the rows, you can use SORTC to get the students in the same order everywhere. Then it is just a question of removing the duplicates (SORT with NODUPKEY):

data sorted;
  set have;
  call sortc(student1,student2);
run;

proc sort nodupkey;
  by student1 student2;
run;

View solution in original post

2 REPLIES 2
s_lassen
Meteorite | Level 14

If you can live with an arbitrary order of your students in the rows, you can use SORTC to get the students in the same order everywhere. Then it is just a question of removing the duplicates (SORT with NODUPKEY):

data sorted;
  set have;
  call sortc(student1,student2);
run;

proc sort nodupkey;
  by student1 student2;
run;
RW9
Diamond | Level 26 RW9
Diamond | Level 26

!!!Post test data in the form of a datastep using the code window which is the {i} above post!!!

 

data have;
  input student1 $ student2 $;
datalines;
A B
A C
A D
B A
B C
B D
;
run;

data want;
  set have;
  array student{2};
  call sortc(of student{*});
run;

proc sort data=want nodupkey;
  by student:;
run;

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