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List:       r-sig-mixed-models
Subject:    Re: [R-sig-ME] Model selection with lme4
From:       Sarah Dryhurst <s.dryhurst () gmail ! com>
Date:       2013-09-18 17:33:12
Message-ID: CAAvYmYPhum_pb+8GX4QRrxxaJNgEm_gBy4SY_BwGARw=va+UoA () mail ! gmail ! com
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Thank you Ben, that was the clarification I needed :-)


On Wed, Sep 18, 2013 at 6:26 PM, Ben Bolker <bbolker@gmail.com> wrote:

> Sarah Dryhurst <s.dryhurst@...> writes:
>
> >
> > Dear list,
> >
> > I am wondering if packages such as MuMIn are suitable for running
> > model selection analyses on lmer objects?
>
>   Yes, with model selection taking place only over the fixed
> effects and with the caveats listed at http://glmm.wikidot.com/faq#aic
>
> >
> > In the MuMIn vignette it gives examples of how to use it with a model
> > from lme4, however the "dredge" function in MuMIn that generates all
> > possible models uses ML, which I thought would not be appropriate for
> > mixed models...?
>
>   Why not ... ?  (If you're thinking about REML, it's not
> appropriate for comparing models with different fixed effects anyway)
>
>   Ben Bolker
>
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>



-- 
NERC PhD Student
Community Ecology and Global Change
Department of Biology
Imperial College, London
email: sarah.dryhurst08@imperial.ac.uk

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