Analysis of Variance (ANOVA)

Part of the Use R! book series (USE R)

Abstract

In this chapter, we generalize the simple t-test for situations where the factor variable takes more than two possible values; hence, the population of interest is divided into multiple groups. The response variable is numerical as before. Analysis of variance (ANOVA) is a method of comparing the means of the response variable across different groups specified by the factor variable. Our primary focus in this chapter is on problems where there is only one categorical factor defining the groups. We refer to the ANOVA method for such problems as one-way ANOVA. Next, we briefly discuss two-way ANOVA methods, where the groups are defined based on two factors (i.e., categorical variables).

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