data feed_indic;
 input add_value I1 I2;
 label I1='accurate'
       I2='vague';
cards;
48.59    1   0
40.71    1   0
45.33    1   0
43.76    1   0
46.41    1   0
44.19    1   0
38.32    0   1
40.26    0   1
47.47    0   1
44.10    0   1
40.09    0   1
42.67    0   1
40.85   -1  -1
35.21   -1  -1
38.17   -1  -1
43.96   -1  -1
34.88   -1  -1
;
run;
proc reg data=feed_indic;
 model add_value=I1 I2;
run;
/*
Compare with the glm fit below.
*/
proc glm data=ma2612.feedback;
 class feedback;
 model add_value=feedback;
 means feedback;
run;