OPTIONS LS=72;
TITLE 'EXAMPLE 12. REGRESSION WITH DUMMY VARIABLE REGRESSORS: TURKEY DATA';
DATA TURKEYS;
N=_N_;
INPUT X Y O $ G V W;
CARDS;
28   13.3   G   1   0   0
20    8.9   G   1   0   0
32   15.1   G   1   0   0
22   10.4   G   1   0   0
29   13.1   V   0   1   0
27   12.4   V   0   1   0
28   13.2   V   0   1   0
26   11.8   V   0   1   0
21   11.5   W   0   0   1
27   14.2   W   0   0   1
29   15.4   W   0   0   1
23   13.1   W   0   0   1
25   13.8   W   0   0   1
;
PROC REG DATA=TURKEYS;
MODEL Y=X/STB CLB COVB SS1 SS2 PCORR1 PCORR2 SCORR1 SCORR2;
OUTPUT OUT=OUT1 P=YPRED R=YRES l95m=l95m u95m=u95m;
RUN;

PROC REG DATA=TURKEYS;
MODEL Y=X G V/STB CLB COVB SS1 SS2 PCORR1 PCORR2 SCORR1 SCORR2;
OUTPUT OUT=OUT2 P=YPRED R=YRES l95m=l95m u95m=u95m;
RUN;