Crossover design : definitions, notes and limitations -- AB/BA design in continuous data -- AB/BA design in dichotomous data -- AB/BA design in ordinal data -- AB/BA design in frequency data -- Three-treatment three-period crossover design in continuous data -- Three-treatment three-period crossover design in dichotomous data -- Three-treatment three-period crossover design in ordinal data -- Three-treatment three-period crossover design in frequency data -- Three-treatment (incomplete block) crossover design in continuous and dichotomous data