Grade point averages versus teacher's ratings
Data for Example 2.6
Ratings
A data frame/tibble with 250 observations on two variables
character variable with students' ratings of instructor (A-F)
students' grade point average
Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.
boxplot(gpa ~ rating, data = Ratings, xlab = "Student rating of instructor",
ylab = "Student GPA")
## Not run:
library(ggplot2)
ggplot2::ggplot(data = Ratings, aes(x = rating, y = gpa, fill = rating)) +
geom_boxplot() +
theme_bw() +
theme(legend.position = "none") +
labs(x = "Student rating of instructor", y = "Student GPA")
## End(Not run)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.