SAS - Create Dummy Variables for All Variables - sas

Question

I have a dataset with X number of categorical variables for a given record. I would like to somehow turn this dataset into a new dataset with dummy variables, but I want to have one command / macro that will take the dataset and make the dummy variables for all variables in the dataset.
I also dont want to specify the name of each variable, because I could have a dataset with 50 variables so it would be too cumbersome to have to specify each variable name.
Lets say I have a table like this, and I want the resulting table, with the above conditions that I want a single command or single macro without specifying each individual variable:

Answer 1

You can use PROC GLMSELECT to generate the design matrix, which is what you are asking for.
data test;
input id v1 $ v2 $ v3 $ ;
datalines;
1 A A A
2 B B B
3 C C C
4 A B C
5 B A A
6 C B A
;
proc glmselect data=test outdesign(fullmodel)=test_design noprint ;
class v1 -- v3;
model id = v1 -- v3 /selection=none noint;
run;
You can use the -- to specify all variables between the first and last. Notice I don't have to type v2. So if you know first and the last, you can get want you want easily.

Answer 2

I prefer GLMMOD myself. One note, if you can, CLASS variables are usually a better way to go, but not supported by all PROCS.
/*Run model within PROC GLMMOD for it to create design matrix
Include all variables that might be in the model*/
proc glmmod data=sashelp.class outdesign=want outparm=p;
class sex age;
model weight=sex age height;
run;
/*Create rename statement automatically
THIS WILL NOT WORK IF YOUR VARIABLE NAMES WILL END UP OVER 32 CHARS*/
data p;
set p;
if _n_=1 and effname='Intercept' then
var='Col1=Intercept';
else
var=catt("Col", _colnum_, "=", catx("_", effname, vvaluex(effname)));
run;
proc sql ;
select var into :rename_list separated by " " from p;
quit;
/*Rename variables*/
proc datasets library=work nodetails nolist;
modify want;
rename &rename_list;
run;
quit;
proc print data=want;
run;
Originally from here and the post has links to several other methods.
https://communities.sas.com/t5/SAS-Communities-Library/How-to-create-dummy-variables-Categorical-Variables/ta-p/308484

Answer 3

Here is a worked example using your simple three observation dataset and a modified version of the PROC GLMMOD method posted by #Reeza
First let's make a sample dataset with a long character ID variable. We will introduce a numeric ROW variable that we can later use to merge the design matrix back with the input data.
data have;
input id :$21. education_lvl $ income_lvl $ ;
row+1;
datalines;
1 A A
2 B B
3 C C
;
You could set the list of variables into a macro variable since we will need to use it in multiple places.
%let varlist=education_lvl income_lvl;
Use PROC GLMMOD to generate the design matrix and the parameter list that we will later use to generate user friendly variable names.
proc glmmod data=have outdesign=design outparm=parm noprint;
class &varlist;
model row=&varlist / noint ;
run;
Now let's use the parameter list to generate rename statement to a temporary text file.
filename code temp;
data _null_;
set parm end=eof;
length rename $65 ;
rename = catx('=',cats('col',_colnum_),catx('_',effname,of &varlist));
file code ;
if _n_=1 then put 'rename ' ;
put #3 rename ;
if eof then put ';' ;
run;
Now let's merge back with the input data and rename the variables in the design matrix.
data want;
merge have design;
by row ;
%inc code / source2;
run;