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To add a regression line to a plot in base R if intercept and slope are given, we can follow the below steps −

- First of all, create two vectors and the scatterplot between them.
- Then, use abline function to create the regression line with intercept and slope given by a and b respectively.

Use plot functions to create scatterplot between two random vectors x and y −

> x<-round(rnorm(20),2) > y<-round(rnorm(20),2) > plot(x,y)

Using abline function to add the regression line to the scatterplot with given intercept a = 0.51 and slope = -1.05 −

> x<-round(rnorm(20),2) > y<-round(rnorm(20),2) > plot(x,y) > abline(a=0.51,b=-1.05)

- Related Questions & Answers
- How to create a scatterplot with regression line using ggplot2 with 0 intercept and slope equals to 1 in R?
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