[R] p values for a GEE model

[Thomas Lumley]

On Tue, 11 Apr 2006, Prof Brian Ripley wrote:

> On Tue, 11 Apr 2006, Thomas Lumley wrote:
>> 
>> He has a linear model with the same number of observations for each person
>
> Not so: some have 3 and some have 2, and the two levels of T are not quite 
> balanced (29/28).
>
>> and no covariates that vary within a person. The independence and
>> exchangeable working correlations will give identical answers.
>
> They do not in this case (nor should they, I believe).
>

You are right, of course.  I believed the message rather than looking at 
the data.

 	-thomas

Thomas Lumley			Assoc. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle