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st: BLONDE MOMENT


From   "Clive Nicholas" <Clive.Nicholas@newcastle.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: BLONDE MOMENT
Date   Thu, 30 Oct 2003 18:24:14 -0000 (GMT)

Sarah,

Forgive me for being thick, but how many different 'structures of
correlation' are there? I'm only aware of two: bivarate and canonical!

C.

>>> (1) I cannot successfully fit an -xtgee- model (ie, xtgee [depvar]
>>> [varlist], family(binomial) link(probit) i(id) t(waves38)). All I get
>>> is
>>> this error message: "estimates diverging (absolute correlation > 1)
>>> r(430);". Uhh? And how can this be got round?
>
> You don't mention what correlation structure you are specifying.  I often
> have this problem when I specify unstructured correlation - which is the
> most general.  If this is the case, you may solve your problem by trying a
> different (appropriate) correlation structure.
>
> Just a thought...
>
> Sarah
>
>
>
>
>
>
> Sarah A. Mustillo, Ph.D
> Department of Psychiatry and Behavioral Sciences
> Duke University School of Medicine
> Box 3454
> Durham NC 27710
>
> 919 687-4686 x231
> *
> *   For searches and help try:
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>


Yours,
CLIVE NICHOLAS,
Politics Building,
School of Geography, Politics and Sociology,
University of Newcastle-upon-Tyne,
Newcastle-upon-Tyne,
NE1 7RU,
United Kingdom.
*
*   For searches and help try:
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*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



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