VIF estimation in R

Brian Smith <[email protected]>
Newsgroups gmane.comp.lang.r.general
Message-ID <CAHUBDY--hkN=2FbThMmKqnjr5noSuKYSQRqNHAqnPfOBhvGGRw@mail.gmail.com> 
I have below model

library(car)

data(Duncan)
vif(lm(prestige ~ income + education - 1, data=Duncan))

With this, I am getting a warning message

Warning message:

In vif.default(lm(prestige ~ income + education - 1, data = Duncan)) :

  No intercept: vifs may not be sensible.


Why for model with no intercept, vifs may not be sensible?
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