Macro loop to generate Proc Tabulate by origin - sas

Question

Using SASHELP.CARS, I would like to make a PROC TABULATE by Origin. So, the first way is to make 3 PROC TABULATE such as :
PROC TABULATE DATA = data out=tabulate;
where Origin="Asia";
CLASS Make DriveTrain ;
TABLE (Make), (DriveTrain) / nocellmerge ;
run;
But, instead, I would like to automatize this in a macro loop (here is a simple example I made. The real database I work with is more complex; this is why I need to make a macro :). Could you please help me why the following code won’t work ? It’s the « where Origin=reg; » part that seems to be the problem. Thank you ! So here is my code:
data data; set sashelp.cars;run;
data classes;
input id_reg reg_name $ ;
cards;
1 Asia
2 Europe
3 USA
run;
%macro comp;
%local i reg;
%do i=1 %to 3;
proc sql ;
select reg_name
into
:reg_name
from classes
where id_reg = &i.;
quit;
%let reg=reg_name;
PROC TABULATE DATA = data out=tabulate_&i;
where Origin=reg;
CLASS Make DriveTrain ;
TABLE (Make), (DriveTrain) / nocellmerge ;
run;
%end;
%mend comp;
%comp

Answer 1

If you insist on using Macro, the correct statement will be generated by double quoting the macro variable resolution so as to inject a string literal into the submit stream.
where Origin="&reg";

Answer 2

Use a BY statement to independently process like grouped subsets of a data set.
Use a WHERE statement to select the subset(s) to process.
Example:
ods html file='output.html' style=plateau;
proc sort data=sashelp.cars out=cars_sorted;
by origin;
run;
title;footnote;
options nocenter nodate nonumber;
PROC TABULATE DATA=cars_sorted;
by origin;
where Origin in ("Asia", "Europe", "USA");
where also make >= 'P'; * further subset for reduced size of output screen shot;
CLASS Make DriveTrain ;
TABLE (Make), (DriveTrain) / nocellmerge ;
run;
ods html close;
Output
Alternatively, use a TABLE statement of form <page dimension>,<row dimension>,<column dimension> in lieu of BY group processing. Such a form does not need presorted data because the is constructed from CLASS variables.
Example:
PROC TABULATE DATA=sashelp.cars; /* original data, not sorted */
where Origin in ("Asia", "Europe", "USA");
where also make >= 'P'; * further subset for reduced size of output screen shot;
CLASS Origin Make DriveTrain ; /* Origin added to CLASS */
TABLE Origin, (Make), (DriveTrain) / nocellmerge ; /* Origin is page dimension */
run;
Output

Answer 3

Thank you very much! Here is the code that works:
data data; set sashelp.cars;run;
data classes;
input id_reg reg_name $ ;
cards;
1 Asia
2 Europe
3 USA
run;
%macro comp;
%local i ;
%do i=1 %to 3;
proc sql ;
select reg_name
into
:reg_name
from classes
where id_reg = &i.;
quit;
PROC TABULATE DATA = data(where=(Origin="&reg_name")) out=tabulate_&i;
CLASS Make DriveTrain ;
TABLE (Make), (DriveTrain) / nocellmerge ;
run;
%end;
%mend comp;
%comp