topic Re: Creating dummy variables for multiple categories in a variable in SAS Enterprise Guide

Creating dummy variables for multiple categories in a variable

munitech4u — Fri, 15 Jul 2016 14:51:18 GMT

I have a variable that has some, 1500 character categories, I want to create dummy variables for these categories. Is there any procedure I can use for the creating these variables. Manually it is quite a tiresome task.

Re: Creating dummy variables for multiple categories in a variable

ballardw — Fri, 15 Jul 2016 14:59:17 GMT

You will need to provide some more details. Are you looking to create one level of dummy for each level that appears in the variable? Multiple variables with 0 / 1 coding for some levels? Groups of like values?

You could provide a some examples of what you are doing manually to give us some idea.

Re: Creating dummy variables for multiple categories in a variable

stat_sas — Fri, 15 Jul 2016 15:06:54 GMT

Hi,

Try proc glmmod with OUTDESIGN= to create dummy variables.

Re: Creating dummy variables for multiple categories in a variable

Reeza — Fri, 15 Jul 2016 15:13:31 GMT

https://communities.sas.com/t5/SAS-Statistical-Procedures/How-to-create-dummy-variables-Categorical-Variables/m-p/258702/highlight/true#M13685

Re: Creating dummy variables for multiple categories in a variable

munitech4u — Fri, 15 Jul 2016 17:06:11 GMT

So variable is like this:
var1
a
b
c
d
e
f
g

And I want in output dataset:
variables a,b,c,d,e,f,g and correponding dummy coded values as 1/0 wherever they are present/not present

Re: Creating dummy variables for multiple categories in a variable

Reeza — Fri, 15 Jul 2016 17:19:40 GMT

There are a couple of solutions here:

http://stackoverflow.com/questions/38340444/sas-creating-dummy-variables-from-categorical-variable/38341503#38341503

Re: Creating dummy variables for multiple categories in a variable

SmcGarrett — Fri, 15 Jul 2016 17:55:21 GMT

%macro cat(indata,outdata, variable);
  proc sql noprint;
   select distinct &variable. 
    into :mvals separated by '|'
    from &indata.;
    %let mdim=&sqlobs;
  quit;

  data &outdata.;
    set &indata.;
    %do _i=1 %to &mdim.;
      %let _v = %scan(&mvals., &_i., |);
      if VType(&variable)='C' then do;
         if &variable. = "&_v." then &_v. = 1;
         else &_v = 0;
      end;
      else do;
         if &variable. = &_v. then &_v. = 1;
         else &_v = 0;
            end;
    %end;
  run;
%mend;

This is the way I have my macro set up:

Run the macro and then just put the name of the input dataset , the name of the output dataset, and the variable which holds the values you are creating the dummy variables for.

%cat(have,want,variable)

Edited at 10:51 PDT. Forgot a ;

Re: Creating dummy variables for multiple categories in a variable

Ksharp — Sat, 16 Jul 2016 06:27:18 GMT


It is easy for IML.



proc iml;
use sashelp.class;
read all var {sex};
close;
vnames=unique(sex);
d=design(sex);
create want from d[r=sex c=vnames];
append from d[r=sex];
close;
quit;
proc print;run;

Re: Creating dummy variables for multiple categories in a variable

dsp1 — Thu, 01 Feb 2018 12:47:38 GMT

In the above macro, I need to give variable name manually. But in some scenarios like I have 400 variables and out of those 400 variables, 90 variables are categorical variables. Then it's very difficult to check and picking all those variables.

Is there any code available to solve these kind of issues ?

Thanks in advance.