Use a two-way layout for experiments with two treatment factors (and no blocking variable). A more elaborate analysis can be done with a regression model. One such analysis is given in Section 3.3.1...

Use a two-way layout for experiments with two treatment factors (and no

blocking variable). A more elaborate analysis can be done with a regression

model. One such analysis is given in Section 3.3.1 for two qualitative factors.

Here the factors have fixed levels.