Analysis of variance (ANOVA) investigates the relationship between categorical independent variables and continuous dependent variables. It can be used to test whether the means of several groups are equal. If there is only one categorical variable as an independent variable, you can perform a one-way ANOVA. On the other hand, if there are more than two categorical variables, you should perform a two-way ANOVA. In this recipe, we discuss how to conduct a one-way ANOVA with R.
mtcars has already been loaded into a data frame within an R session. Since the
TukeyHSD functions originated from the
stats package, make sure the library,
stats, is loaded.
Perform the following ...