In the fixed effects model with interaction assume that ther

In the fixed effects model with interaction, assume that there are 5 levels of factor A, 4 levels of factor B, and 3 observations (replications) for each of the 20 combinations of levels of the two factors. Then the number of degrees of freedom of the interaction sum of squares (SSAB) is:

a.12

b. 20

c. 15

d. 60

e. 59

Solution

a) 12