RLRsim masked VarCorr

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Dear Mollie,

Try nlme:VarCorr(mod1) instead of VarCorr(mod1)

Best regards,

Thierry

----------------------------------------------------------------------------
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek
team Biometrie & Kwaliteitszorg
Gaverstraat 4
9500 Geraardsbergen
Belgium

Research Institute for Nature and Forest
team Biometrics & Quality Assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium

tel. + 32 54/436 185
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

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-----Oorspronkelijk bericht-----
Van: r-sig-mixed-models-bounces at r-project.org [mailto:r-sig-mixed-models-
bounces at r-project.org] Namens Mollie Brooks
Verzonden: maandag 25 juli 2011 19:17
Aan: r-sig-mixed-models at r-project.org
Onderwerp: [R-sig-ME] RLRsim masked VarCorr

Hi,
I need to use the packages lmer and RLRsim in some code. I need to extract the
interclass correlation and I would use the following lines

growdat=data.frame(individual=rep(rep(1:8),3), growth=rep(rnorm(8, mean=0,
sd=2),3)+rnorm(3*8, sd=1)) mod1=lmer(growth~(1|individual), data=growdat)
ind_var=attr(VarCorr(mod1)$individual,"stddev")^2
res_var=attr(VarCorr(mod1),"sc")^2

but this causes the error
Error in UseMethod("VarCorr") :
 no applicable method for 'VarCorr' applied to an object of class "mer"
Calls: VarCorr
Execution halted

because loading RLRsim masked the function VarCorr.
Is there an alternative way to get these elements out of the mer object?
Extracting them before loading RLRsim isn't an option because the model fits
and info extraction are in a big loop for replication.

thanks,
Mollie

Mollie Brooks
Ph.D. Candidate
NSF IGERT Fellow
Biology Department
University of Florida
mbrooks at ufl.edu
www.zoology.ufl.edu/mbrooks

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