Summary
This is the author speaking here. What a great chapter! Yeah, I know I should not say that since I am the author of the book, nevertheless, I think the one you just completed was a relevant step towards your discovery of R for data mining. You are now able to:
- Fit a linear model in R, both having a single explanatory variable and multiple explanatory variables (univariate and multivariate) through the
lm()
 function and assess its estimates through thesummary()
function - Evaluate whether the linear regression model assumptions are met, through the
durbinWatsonTest()
andNCVtest()
functions - Perform principal component regression on your data through the
pcr()
 function - Perform stepwise regression through the
stepAIC()
function and evaluate its output - Compare and interpret the output and performance of different regression models and evaluate whether your model is a reasonable way to describe the observed phenomenon
It's now time to take a closer look at what a model performance, introducing...