[R] Incomplete Output from lmer{lme4}

Martin Henry H. Stevens HStevens at MUOhio.edu
Thu May 18 17:59:43 CEST 2006


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On May 18, 2006, at 11:40 AM, Lusk, Jeffrey J wrote:

> I'm still relatively new to R, so my apologies if this is covered
> somewhere.  I've been running some mixed-effect models in R using
> lme{nlme}, but read in Faraway's recent book, Extending the Linear  
> Model
> with R, that lmer in package lme4 is a much improved version.  I tried
> using this approach, but the output for the fixed effects doesn't  
> report
> a p-value or the degrees of freedom (unlike the examples listed in
> Faraway's book, which I tried and got the same incomplete output).   
> Any
> idea how I can get the complete output?
P-values for model coefficients are based on a Monte Carlo resampling  
using mcmcsamp. Do ?mcmcsamp. Results are best summarized with the  
summary function in the coda package.
P-values for anova are done with stepwise model building
anova(larger.model, smaller.model)
>
> In a related problem, I've been having trouble with the lines and  
> abline
> in the graphics package.  Occasionally, they fail to add the requested
> line to the figure, but R doesn't return any error (it's as if  
> executing
> the command does nothing).  I've replicated this problem with code and
> data directly from R texts such as Crawley's Statistics: An  
> Introduction
> Using R, so I don't think it is operator error (but it could be).  Any
> ideas?
Couldn't tell you without and example.
Cheers,
Hank
>
> Thanks,
>
> Jeff--
> ________________________________________________________
>
> Jeffrey J. Lusk, Ph.D.
> Postdoctoral Research Associate
> Department of Forestry & Natural Resources
> Purdue Climate Change Research Center
> Purdue University
> 715 West State Street; Pfendler Hall
> West Lafayette, IN 47907
> Phone:  765-494-9701
> E-mail:  jjlusk at purdue.edu
> Web: http://www.geocities.com/jefflusk2002
>
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> PLEASE do read the posting guide! http://www.R-project.org/posting- 
> guide.html

Dr. M. Hank H. Stevens, Assistant Professor
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Miami University
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