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.
Ensure that mtcars
has already been loaded into a DataFrame within an R session. Since the oneway.test
and TukeyHSD
functions originated from the stats
package, make sure the library, stats
, is loaded.