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st: VIF and invariant variables or trend

From   "dora sepour" <>
To   <>
Subject   st: VIF and invariant variables or trend
Date   Sun, 4 Nov 2007 17:02:12 +0100

Dear all,
Before estimating the panels data model, i want to detect muliticollinearity between x1 and others explanatory variables. using vif, i regress x1 on x2, x3,...,xk

My question is: could the explanatory variables x1,x2, ...,xk invariant variables (like geographical distance), trend and dummies?

Thanks in advance for your suggestions,

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