[R] What is the default covariance structure in the glmmPQL function (MASS package)?

Bert Gunter bgunter.4567 at gmail.com
Wed Jan 31 17:23:25 CET 2018


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Bert Gunter

"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )

On Wed, Jan 31, 2018 at 1:35 AM, Gerda Börner <gerdaboerner at gmx.de> wrote:
> Hello,
> currently I am trying to fit a generalized linear mixed model using the
> glmmPQL function in the MASS package. I am working with the data provided by
> the book from Heck, Thomas and Tabata (2012) -
> https://www.routledge.com/Multilevel-Modeling-of-Categorical-Outcomes-Using-IBM-SPSS/Heck-Thomas-Tabata/p/book/9781848729568
> I was wondering, which variance-covariance structure the glmmPQL function is
> using by default and if it is possible to vary the variance-covariance
> structure with the glmmPQL function. Unfortunately I couldn't manage to find
> out myself.
> If it is possible to change it, could someone tell me how to do so? I am
> especially interested in a diagonal structure versus an unstructured
> variance-covariance structure.
> Thanks a lot in advance.
> Gerda
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