如何用ggpairs获得R ^ 2? [英] How to get R^2 with ggpairs?
问题描述
如何使 ggpairs
用R ^ 2而不是相关性报告上角?
How to make ggpairs
report the upper corner with R^2 instead of correlation?
library(GGally)
ggpairs(mtcars[c("mpg", "disp", "hp", "drat", "wt", "qsec")])
推荐答案
我认为您需要编写一个自定义函数,如下所示.(这种方法的一个警告是,与相关性不同,r ^ 2假定一个因变量,因此可能不明智.)
I think that you will need to write a custom function, shown below. (One caveat to this approach is that different to correlation the r^2 assumes a dependent variable so this may not be sensible).
library(GGally) # version 1.5.0
lm_fun <- function(data, mapping, ndp=2, ...){
# Extract the relevant columns as data
x <- eval_data_col(data, mapping$x)
y <- eval_data_col(data, mapping$y)
# Calculate the r^2 & format output
m <- summary(lm(y ~ x))
lbl <- paste("r^2: ", formatC(m$r.squared, digits=ndp, format="f"))
# Write out label which is centered at x&y position
ggplot(data=data, mapping=mapping) +
annotate("text", x=mean(x, na.rm=TRUE), y=mean(y, na.rm=TRUE), label=lbl, parse=TRUE, ...)+
theme(panel.grid = element_blank())
}
# Call
ggpairs(mtcars[c("mpg", "disp", "hp", "drat", "wt", "qsec")],
upper=list(continuous=lm_fun))
编辑:您能帮忙解释一下如何在r ^ 2和值之间的lbl中添加新行吗?
EDIT: Can you please help to explain how to add a new line into the lbl between r^2 and the value?
您可以通过将相关代码更改为以下任意一种来使用 atop
:
You can use atop
by changing the relevant code to either:
lbl <- substitute(atop(~r^2*':', v),
list(v=formatC(m$r.squared, digits=ndp, format="f")))
或
v <- formatC(m$r.squared, digits=ndp, format="f")
lbl <- bquote(atop(~r^2*':', .(v)))
然后您需要调整 annotate
调用以正确解析标签
You then need to tweak the annotate
call to correctly parse the label
annotate("text", x=mean(x, na.rm=TRUE), y=mean(y, na.rm=TRUE),
label=deparse(lbl), parse=TRUE, hjust=0, ...)
我添加了 just = 0
,以尝试使文本左对齐,但效果不佳.
I added hjust=0
in an attempt to left-align the text but this hasn't quite worked.
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