R help - Jun 2012 - SVY: variance inflation factor VIF with complex survey

Hello,

 Seeking a way to get the variance inflation factor VIF for a model of
regression in complex survey, I have understood that without this package
(SURVEY) RGui VIF obtained as follows:

fit <- lm(mpg~disp+hp+wt+drat, data=mtcars)
 				
vif(fit)

But I want to know if survey, Vif is obtained so

vif( svyglm(api00~ell+meals+mobility, design=dstrat))

Thank you, happy day
 		 	   		  
	[[alternative HTML version deleted]]

Dear Diana,

I'm not sure that I entirely understand your question, but the vif()
function in the car package should work, I think, with objects produced by
svyglm(), since the latter inherit from "lm" and since the vif.lm()
method works from the covariance matrix of the coefficients.

I hope this helps,
 John

------------------------------------------------
John Fox
Sen. William McMaster Prof. of Social Statistics
Department of Sociology
McMaster University
Hamilton, Ontario, Canada
http://socserv.mcmaster.ca/jfox/

On Thu, 28 Jun 2012 12:28:54 -0500
 Diana Marcela Martinez Ruiz <dianammr06 at hotmail.com>
wrote:
> 
> Hello,
> 
>  Seeking a way to get the variance inflation factor VIF for a model of
regression in complex survey, I have understood that without this package
(SURVEY) RGui VIF obtained as follows:
> 
> fit <- lm(mpg~disp+hp+wt+drat, data=mtcars)
>  				
> vif(fit)
> 
> But I want to know if survey, Vif is obtained so
> 
> vif( svyglm(api00~ell+meals+mobility, design=dstrat))
> 
> Thank you, happy day
>  		 	   		  
> 	[[alternative HTML version deleted]]
> 
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