The vif() function, part of the car package, can be used to compute variance inflation factors. Most VIF’s are low to moderate for this data. The car package is not part of the base R installation so it must be downloaded the first time you use it via the install.packages option in R.

install.packages("car")

Once the package is installed on your computer, then you can load it and use the functions that are part of that package.

library(car)
vif(lm.fit)
    crim       zn    indus     chas      nox       rm      age      dis      rad      tax 
1.792192 2.298758 3.991596 1.073995 4.393720 1.933744 3.100826 3.955945 7.484496 9.008554 
 ptratio    black    lstat 
1.799084 1.348521 2.941491 

Try calling the vif function from the given model:

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Assume that:

• The MASS and car libraries have been loaded
• The Boston dataset has been loaded and attached