图 17.1 展示了对温度和臭氧水平之间的进一步研究.
library(ggplot2) ggplot(airquality, aes(Temp, Ozone)) + geom_point() + geom_smooth(method = "loess")
library(knitr) df <- data.frame(Name = c("Alice", "Bob", "Charlie"), Age = c(25, 30, 35)) kable(df)