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
[EMAIL PROTECTED] University of Washington, Seattle
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