[R-sig-ME] GLMM parameter interpretation

[Adam Smith]

Thanks, although I should correct an omission in my description.  Factor A does not vary within level 1 OR level 2 subjects.  Does this change anything for that covariate?

Adam

----------------------------------------
> From: Thierry.ONKELINX at inbo.be
> To: raptorbio at hotmail.com; r-sig-mixed-models at r-project.org
> Subject: RE: [R-sig-ME] GLMM parameter interpretation
> Date: Fri, 20 Jan 2012 08:31:03 +0000
>
> A quick answer: No
>
> ir. Thierry Onkelinx
> Instituut voor natuur- en bosonderzoek / Research Institute for Nature and Forest
> team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
> Kliniekstraat 25
> 1070 Anderlecht
> Belgium
> + 32 2 525 02 51
> + 32 54 43 61 85
> Thierry.Onkelinx at inbo.be
> www.inbo.be
>
> To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of.
> ~ Sir Ronald Aylmer Fisher
>
> The plural of anecdote is not data.
> ~ Roger Brinner
>
> The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data.
> ~ John Tukey
>
>
> -----Oorspronkelijk bericht-----
> Van: r-sig-mixed-models-bounces at r-project.org [mailto:r-sig-mixed-models-bounces at r-project.org] Namens Adam Smith
> Verzonden: vrijdag 20 januari 2012 5:22
> Aan: r-sig-mixed-models at r-project.org
> Onderwerp: [R-sig-ME] GLMM parameter interpretation
>
>
> All,
>
> A quick question, and an easy one I expect.
>
> Suppose the following generic overdispersed log-linear model:
>
> Count ~ A + B + C + (1|level1) + (1|level2) + (1|obs)
>
> A, B, and C are all factors.
> A does not vary within level1 subjects.
> B does not vary within level2 subjects.
> C varies within level 1 and level 2 subjects.
>
> Does the conditional nature of the GLMM and the lack of variation in A (within level 1 subjects) and B (within level 2 subjects) result in nonsensical or uninterpretable coefficients for these two covariates?
>
> Thanks,
>
> Adam Smith
> Dept. Natural Resources Science
> 105 Coastal Institute in Kingston
> University of Rhode Island
>
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