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

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Occasional Contributor
Posts: 10

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

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!

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Solution
‎09-25-2015 06:23 AM
Super Contributor
Posts: 353

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

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;

All Replies
Solution
‎09-25-2015 06:23 AM
Super Contributor
Posts: 353

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

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;

Occasional Contributor
Posts: 10

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

Thanks so much! It works very well!
Posts: 2,816

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

Use PROC GLMMOD to create dummy variables.

--
Paige Miller
Occasional Contributor
Posts: 10

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

Thanks PaigeMiller!

🔒 This topic is solved and locked.

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