Dear R community,



Here are details of my model, which gives me trouble modeling
autocorrelation.



lm11<-lme(Soil.temp ~ Veg*M+Veg*year,

           data=a,

           random = list(Site=pdDiag(~Veg),

                                   Plot=pdDiag(~Veg))



dataset:



a-data frame of daily measurements of soil temperature (Soil.temp) over six
years

Site (6 sites),

Plot(2 plots per site),

Veg(2 vegetation types: 2 sites as grassland, 4 sites as forest)

M-month (categorical predictor)

year (continues)



Thanks,

Julia


> Van: r-help-bounces@r-project.org [mailto:r-help-bounces@r-project.org]
> Namens J S
> Verzonden: vrijdag 16 mei 2008 23:06
> Aan: r-help@r-project.org
> Onderwerp: [R] autocorrelation in nlme; Error: cannot allocate vector of
> size
>
> Dear R community,
>
>
>
> I used a linear mixed model (named lm11) to model daily soil temperature
> depending upon vegetation cover and air temperature. I have almost
> 17,000
> observations for six years.
>
>
>
> I can not account for autocorrelation in my model, since I receive the
> error
> message after applying the function:
>
>
>
> update(lm11, corr=corAR1())
>
>
>
> Error: cannot allocate vector of size 220979 Kb
>
>
>
> Do you have any suggestions?
>
>
>
> Thanks, Julia
>
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>
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