如何使用R在散点图上绘制R平方值?

问题描述：

这似乎是一个简单的问题，所以我希望它是一个简单的答案.我正在绘制我的点并拟合线性模型，可以这样做.然后，我还要在图表上绘制一些摘要统计信息，例如R平方值.我似乎只能在命令行中获得R Squared值. 任何建议；我需要看ggplot还是其他东西?预先感谢.

This seems a simple question, so I hope its a simple answer. I am plotting my points and fitting a linear model, which I can do OK. I then want to plot some summary statistics, for example the R Squared value, on the plot also. I can only seem to get the R Squared value at the command line. Any advice; do I need to be looking at ggplot or anything else? Thanks in advance.

#Does the plot
plot(df$VAR1, df$VAR2)
#Adds the line
abline(lm(df$VAR2~df$VAR1), col="red")
#Shows stats on command line
summary(lm(df$VAR2~df$VAR1))

答

您可以滥用legend()，因为它具有方便的逻辑位置:

You can abuse legend() because it has the handy logical placement:

R> DF <- data.frame(VAR1=rnorm(100), VAR2=rnorm(100))
R> with(DF, plot(VAR1, VAR2))
R> abline(fit <- lm(VAR2 ~ VAR1, data=DF), col='red')
R> legend("topright", bty="n", legend=paste("R2 is", 
+         format(summary(fit)$adj.r.squared, digits=4)))

在这里bty="n"取消显示该框，您需要format()来缩短显示.其他text()很好，参数main=和sub=到plot()也是如此.

Here bty="n" suppresses the box, and you need format() to shorten the display. Other text() is good, as are arguments main= and sub= to plot().

如何使用R在散点图上绘制R平方值?

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