Hi All,


I need to calculate VIF (variance inflation factor) for my linear regression model. I found there was a function named  vif in 'HH' package. I have two questions:


1)      I was able to install that package in my R under windows. But while trying to install that package in UNIX, I got error:

Package HH is not available.

            Does somebody know why?


2)      Does somebody know the other way to calculate vif in R?


Many thanks.
HXD

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