QQ图:两个以上的数据 [英] QQ plot: More than two data

问题描述

我想绘制类似于此图片的QQ图:

I wanted to graph a QQ plot similar to this picture:

我设法使用两个样本获得了一个QQ图，但是我不知道如何在该图上添加第三个图. 这是我的结果:

I managed to get a QQ plot using two samples, but I do not know how to add a third one to the plot. Here is my result:

这是我使用的代码:

qqplot(table$Bedouin, table$Tunisia, xlim = c(-0.25,0.25), ylim = c(-025,0.25))

在表格数据框中，我还要添加其他人群.但是我不能.

In my table data frame I have other populations I would like to add. But I can't.

谢谢.

推荐答案

我想您正在查找排序值的散点图，因为所有变量都存储在同一数据帧中.

I suppose you're looking for a scatterplot of sorted values since all variables are stored in the same data frame.

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函数创建图的方法:

This is a way to create the plot with basic R functions:

# 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"))

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