[R] Problem about collinearity diagnosis

[frank.chiang]

Hi,

I try to calculate condition indexes and variance decomposition proportions
in order to test for collinearity using colldiag() in perturb package, I got
a large index and two variables with large variance decomposition
proportions,but one of them is constant item.I also checked the VIF for that
variable, the value is small.The result is as follows:

Index	  intercept	   V1	 V2
163.54      0.97	 0.81	 0.16

VIF(V1)=1.4

V1,V2 are two variables with largest variance decomposition proportions.

I haven't got the Belsley's book, and don't quite understand what's the
meaning of collinearity between 

intercept and one variable.If that's the case, how to deal with it? Discard
the V1 variable? Anyone can 

give me some suggestions?Thanks

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