How to create a dummy variable based on if the value in one column can be found in another one?

[tomtom09]

Hi guys. I have two columns value1 and value2, in value1, say, I have three observations a, b, c, in value2, I have 4 observations a, a, b,m, I want to create a dummy variable match for each row in value1, if the value can be found in value 2, then match=1 otherwise it is 0. So for this dataset, it should be 1,1,0. Can anyone help me with this? Thanks a lot!

[user24feb · Accepted solution]

Data A;
  Input value1 $ value2 $;
  Datalines;
a a
b a
c b
. m
;
Run;

Data B;
  If _N_ eq 1 Then Do;
    Declare Hash H (Dataset:'A (Drop=value1 Rename=(value2=value1)');
 H.Definekey('value1');
 H.Definedone();
 If 0 Then Set A (Drop=value1 Rename=(value2=value1));
  End;
  Set A;
  dummy=1-Min(H.Find(),1);
Run;

[tomtom09]

Thanks so much! It works very well!

[PaigeMiller]

Use PROC GLMMOD to create dummy variables.

[tomtom09]

Thanks PaigeMiller!