R 在图本身上打印线性回归方程

本文介绍了R 在图本身上打印线性回归方程的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我们如何在图上打印一条线的方程?

How do we print the equation of a line on a plot?

我有 2 个自变量，想要一个这样的方程:

I have 2 independent variables and would like an equation like this:

y=mx1+bx2+c where x1=cost, x2 =targeting

我可以绘制最佳拟合线，但如何在图中打印方程?

I can plot the best fit line but how do i print the equation on the plot?

也许我不能在一个方程中打印 2 个自变量，但我该怎么做呢?y=mx1+c 至少?

Maybe i cant print the 2 independent variables in one equation but how do i do it for say y=mx1+c at least?

这是我的代码:

fit=lm(Signups ~ cost + targeting) plot(cost, Signups, xlab="cost", ylab="Signups", main="Signups") abline(lm(Signups ~ cost))

推荐答案

我尝试将输出自动化一点:

I tried to automate the output a bit:

fit <- lm(mpg ~ cyl + hp, data = mtcars) summary(fit) ##Coefficients: ## Estimate Std. Error t value Pr(>|t|) ## (Intercept) 36.90833 2.19080 16.847 < 2e-16 *** ## cyl -2.26469 0.57589 -3.933 0.00048 *** ## hp -0.01912 0.01500 -1.275 0.21253 plot(mpg ~ cyl, data = mtcars, xlab = "Cylinders", ylab = "Miles per gallon") abline(coef(fit)[1:2]) ## rounded coefficients for better output cf <- round(coef(fit), 2) ## sign check to avoid having plus followed by minus for negative coefficients eq <- paste0("mpg = ", cf[1], ifelse(sign(cf[2])==1, " + ", " - "), abs(cf[2]), " cyl ", ifelse(sign(cf[3])==1, " + ", " - "), abs(cf[3]), " hp") ## printing of the equation mtext(eq, 3, line=-2)

希望能帮到你，

亚历克斯