In Example 7.8, we suggested two different schemes for coding the qualitative variables.

a. Suppose you had fit four separate equations for the four groups with coefficients (0,0), (7).

(b) and (PP). Relate these coefficients to the 8, and B, in (7.31) and (7.33).

b. A third alternative coding for the qualitative variables is given by 1 if male 1 if science M = 1 if arts.. -{. } G= 1 if female Relate the coefficients in this model to those in the four separate equations in part a Section 7.3.2