Re: st: robust cluster in GLM

[Steven Samuels <sjhsamuels@earthlink.net>]

-

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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