**************************************************
* 2-WAY Crosstabulation from summary data        *
**************************************************;
DATA;
   DO A = 1 TO 2;
       DO B = 1 TO 2;
          INPUT WT @@;
          OUTPUT;
       END;
   END;
DATALINES;
12 15
18 3
;
ODS RTF;
PROC FREQ;
   WEIGHT WT;
   TABLES A*B /CHISQ ;
   TITLE 'CHI-SQUARE ANALYSIS FOR A 2X2 TABLE';
RUN;
ODS RTF CLOSE;