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Re: st: RE: [correlation structures]

From   "Sarah A. Mustillo" <[email protected]>
To   [email protected]
Subject   Re: st: RE: [correlation structures]
Date   Thu, 30 Oct 2003 13:58:15 -0500

Type -help xtgee- for a list of correlation structures. The help file lists them but does not explain them. You can do a Google search and find adequate explanations of the different structures.


--On Thursday, October 30, 2003 6:47 PM +0000 Clive Nicholas <[email protected]> wrote:


Would love to, but don't have the documentation. I've already spent more
than enough on software and other Stata books. :-)


This refers to correlation structures
in time. For more details, see the documentation
on -xtgee-.

[email protected]

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

>>> (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.
*   For searches and help try:

Politics Building,
School of Geography, Politics and Sociology,
University of Newcastle-upon-Tyne,
NE1 7RU,
United Kingdom.
*   For searches and help try:

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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