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st: Covariance structures for xtmelogit with a single random effect
From
Najib Mozahem <[email protected]>
To
[email protected]
Subject
st: Covariance structures for xtmelogit with a single random effect
Date
Mon, 9 Sep 2013 17:55:39 +0300
Hi,
I am using xtmelogit on my dataset. My model has only a random intercept because a likelihood test revealed that random coefficients do not contribute significantly to the model. I want to try out several covariance structures but whenever I try any structure I get the following:
xtmelogit span1 i.type i.freq pages totalactive c.age##c.age c.time##c.time || id:, cov(unstructured) mle
Note: single-variable random-effects specification in id equation; covariance structure set to identity
On page 300 of "Multilevel and Longitudinal Modeling using stata" by Rabe-hesketh and Skrondal they fit a xtmixed model with just a random intercept using the residuals() option in order to specify an unstructured matrix, but this option does not exist for xtmelogit. Is there a way to try several covariance structures using xtmelogit?
Thanks
Najib
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