1. Introduction -- 2. One-way analysisof variance, all categories -- Two groups -- More than two g roups -- 3. Two-way analysisof variance, all categorie -- Unrelated explanatory variables -- Related explanatory variables -- Special topics -- 4. Analysisof variance, sample of categories -- One-way analysis -- Two explanatory variables -- 5. Other models -- Mixed models -- Three explanatory variables -- Latin square design -- Nested designs -- Analysisof variance and regression -- 6. Conclusions