[R] likelihood ratio tests using glmmPQL

[Douglas Bates]

If you use lmer from the lme4 package (actually it is in the Matrix
package but "logically" it is in the lme4 package) to fit a
Generalized Linear Mixed Model you have the option of using PQL, or
the Laplace approximation or Adaptive Gauss-Hermite Quadrature (AGQ). 
The log-likelihood for any of these methods, including PQL, is an
approximation to the actual log-likelihood of the GLMM model and can
be used for likelihood ratio tests.

On 11/30/05, Elizabeth Boakes <Elizabeth.Boakes at ioz.ac.uk> wrote:
>
>
> I am analysing some binary data with a mixed effects model using
> glmmPQL.
>
> I am aware that I cannot use the AIC values to help me find the minimum
> adequate model so how do I perform likelihood ratio tests?  I need to
> fix on the minimum adequate model but I'm not sure of the proper way to
> do this.
>
>
>
> Thank you very much,
>
> Elizabeth Boakes
>
> Elizabeth Boakes
> PhD Student
> Institute of Zoology
> Regent's Park
> London NW1 4RY
> tel: 020 7449 6621
>
>
>
>
>
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