QQ情节:两个以上数据

我想你正在寻找一个排序值的散点图,因为所有变量都存储在同一个数据框中.

示例数据集:

set.seed(10)
dat <- data.frame(A = rnorm(20), B = rnorm(20), C = rnorm(20))

这是一种使用基本R函数创建绘图的方法:

# create a QQ-plot of B as a function of A
qqplot(dat$A, dat$B, xlim = range(dat), ylim = range(dat), 
       xlab = "A", ylab = "B/C")
# create a diagonal line
abline(a = 0, b = 1)
# add the points of C
points(sort(dat$A), sort(dat$C), col = "red")
# create a legend
legend("bottomright", legend = c("B", "C"), pch = 1, col = c("black", "red"))