ABSTRACT
Three-factor ANOVAs are encountered reasonably often in psychology, and their complexity means that the first few designs you will see will require considerable effort before the effects are understood. These designs need to be treated with great respect and should never be attempted for project work if there are any difficulties in understanding the meaning of a three-way interaction — the most complicated outcome of a three-factor design. The mathematics of performing a three-factor ANOVA will not be demonstrated in this chapter. There is nothing new to learn, and without a computer to perform calculations, the chance of making an error at some stage is so great that there is nothing to gain in performing an analysis by hand.
