? P&R Exercise 4.3

options crt limwarn=0;

freq q;
smpl 54:1 95:2;
read(file='ex32.xls', format=excel) gc gyd;
consum=gc;
y=gyd;
s=y-consum;

olsq consum c y;
olsq consum c y consum(-1);
olsq s c y;