Help using Base SAS procedures

Create a variable with case when

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Occasional Contributor
Posts: 10

Create a variable with case when

Hello,

 

I am working with a dataset where the Race Category was input rather oddly.

Essentially, I have 8 binary variables, Race_White, Race_Black, Race_Asian, etc. 

For each variable the response is 0 if false or 1 if true. 

I need to combine each of these variables into a single race category for analysis.

Essentially creating a variable of Race where 1=White, 2=Black, 3=Asian etc. from the binary variables.

 

So far I am striking out. it seems to me this should be an if then function but I seem to be missing something

Super User
Super User
Posts: 9,599

Re: Create a variable with case when

Posted in reply to DanielQuay

Will the variables only be populated once?  If so you could just do:

data want;
  set have;
  select (sum(of race_:));
    when 1 then race="White";
    when 2 then race=...;
    ...
  end;
run;

If not then you would need to do each one, and cat the result:

data want;
  set have;
  array r{*} race_;;
  do i=1 to dim(r);
    if r{i}=1 then race=catx(',',race,vname(r{i});
  end;
  race=tranwrd(race,"race_","");
run;
Super User
Posts: 23,778

Re: Create a variable with case when

Posted in reply to DanielQuay

It's not odd. It's done this way to account for multiple entries, ie someone can flag both White and Black, and it's also how a regression model requires the variables for analysis - with the dummy coded values of 0/1.  Make sure you need to change it first.

 


@DanielQuay wrote:

Hello,

 

I am working with a dataset where the Race Category was input rather oddly.

Essentially, I have 8 binary variables, Race_White, Race_Black, Race_Asian, etc. 

For each variable the response is 0 if false or 1 if true. 

I need to combine each of these variables into a single race category for analysis.

Essentially creating a variable of Race where 1=White, 2=Black, 3=Asian etc. from the binary variables.

 

So far I am striking out. it seems to me this should be an if then function but I seem to be missing something


 

 

Occasional Contributor
Posts: 10

Re: Create a variable with case when

Thanks for the assistance, though I figured out how to do it without using an array. 

The issue I was having was a simple thing in my data statement.

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