[R] Help with lme4 model specification

[boeinguy2]

Thanks! I made this correction


ONKELINX, Thierry wrote:
> 
> 
> Please note that the case of characters is important in R. Hence "True"
> differs from "TRUE". You need to use REML = TRUE instead of REML = True!
> The only valid logical values are TRUE, FALSE, T and F. But I recommend
> to use only TRUE and FALSE. Because you can overwrite T and F. You could
> do something like T <- FALSE, which is ofcourse not a good idea. TRUE
> and FALSE can not be overwritten.
> 
> HTH,
> 
> Thierry
> 
> 
> ------------------------------------------------------------------------
> ----
> ir. Thierry Onkelinx
> Instituut voor natuur- en bosonderzoek / Research Institute for Nature
> and Forest
> Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
> methodology and 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
> 
> 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-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
> Namens boeinguy2
> Verzonden: donderdag 7 mei 2009 0:21
> Aan: r-help at r-project.org
> Onderwerp: [R] Help with lme4 model specification
> 
> 
> I am new to R and am trying to specify a model for mixed model analysis.
> 
> When I run the following model I get an error:
> 
> AAT<- lmer(Y ~ S + A + (1|S:A/H), data=AT, REML=True)
> 
> The error looks like this:
> 
> Error in Spar_loc:`:` : NA/NaN argument
> In addition: Warning messages:
> 1: In model.matrix.default(mt, mf, contrasts) :
>   variable 'Spar_loc' converted to a factor
> 2: In Spar_loc:`:` :
>   numerical expression has 720 elements: only the first used
> 
> I am having trouble specifying th random component.  It should reflect
> the
> random term as H nested within the interaction of S & A.  What am I
> doing
> wrong?
> :confused:
> -- 
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