An object of class anova (inherits from data.frame) with 8 rows and 5 columns.
Examples
if (FALSE) {
data <- iris
data$Cat1 <- rep(c("X", "X", "Y"), length.out = nrow(data))
data$Cat2 <- rep(c("A", "B"), length.out = nrow(data))
anova(lm(Sepal.Length ~ Species * Cat1 * Cat2, data = data))
}