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Re: st: robust cluster in GLM


From   "Leny Mathew" <lenymathewc@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: robust cluster in GLM
Date   Tue, 16 Sep 2008 17:12:05 -0400

Sorry about that Steve, SE of the coefficient. Time is in weeks and is
used as continuous in the model. The average at T1 is 10 weeks, T2 is
20 weeks and T3 is 29.7 weeks.

Leny

On Tue, Sep 16, 2008 at 4:27 PM, Steven Samuels
<sjhsamuels@earthlink.net> wrote:
> -
>
> Leny, "standard error" of what?  Please follow the Statalist FAQ (section
> 3.3) and "Say exactly what you typed and exactly what Stata typed (or did)
> in response. N.B. exactly!"  Are the time-points equally spaced?  If so, and
> you are estimating the slope, then the middle time point would be ignored.
>
> -Steve
>
>
> On Sep 16, 2008, at 3:46 PM, Leny Mathew wrote:
>
>> Dear Statalisters,
>>                          I'm using a GLM model with robust cluster
>> option to model longitudinal data across three time points. I have the
>> dependent variable on 80 cases at T1 and T2, but have only 77 at the
>> third time point. When I run the model the number of observations is
>> 237, but it says that the standard error is adjusted for 80 clusters.
>> Why would this be the case? How does stata take the missing info for
>> the 3 people at T3 into consideration when it calculates the
>> parameters and SE?
>>
>> Thanks in advance for any suggestions,
>>
>> Leny
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