How to use ggplot to make a qqplot to compare the distribution of two variables?-CodePudding

I'd like to know how is possible to make a qqplot with ggplot2 that compares two distributions and not a distribution to a theoretical distribution. I want something like this;

qqplot(iris$Petal.Length, iris$Petal.Width)

that compares the quartiles of Petal.Length and Petal.Width in iris dataset, but using ggplot2.

CodePudding user response：

One easy way to reproduce the plot is to convert the qqplot call to a dataframe and then plot it with ggplot2:

qq <- as.data.frame(qqplot(iris$Petal.Length, iris$Petal.Width, plot.it = FALSE))
ggplot(qq)   
  geom_point(aes(x = x, y = y))