Machine Learning with R Cookbook - Second Edition

How to do it...

Perform the following steps to fit the robust linear regression model with rlm:

1. Generate a scatter plot of the x variable against y3:

        > plot(Quartet$x, Quartet$y3)  

Scatter plot of variables x and y3

2. Next, you should import the MASS library first. Then, you can apply the rlm function to fit the model, and visualize the fitted line with the abline function:

        > library(MASS)
        > lmfit = rlm(Quartet$y3~Quartet$x)
        > abline(lmfit, col="red")  

Robust linear regression to variables x and y3