Multifactor Experimental Designs

In order to study the effects of two or more factors on a response variable, factorial designsDesignfactorial are usually used. By following these designs, all possible combinations of the levels of the factors are investigated. The factorial designs are ideal designs for studying the interaction effect between factors. By interactionInteraction effect effect, we mean that a factor behaves differently in the presence of other factors such that its trend of influence changes when the levels of other factors change. This has already been discussed in Chap.  1 . In this chapter, we will learn more about factorial design and analysis of experimental data obtained by following such designs.