[R] having problems with the lme function

8rino-Luca Pantani ottorino-luca.pantani at unifi.it
Tue Oct 23 10:19:40 CEST 2007

Hi Rodrigo,
it is not easy to anwer your question since you did not provide some
data to work with, nor what went wrong with your code.
Anyway, as far as I can catch I would try the following

df.GD <- groupedData(Y ~ fact_A +fact_B|fact_C, data=DataFrame)
lme.1 <-lme(y~fact_A + fact_B, data=GD, random=~1|fact_C)

I'm not sure on the syntax for corClasses, but from the book cited below 
I see some examples like

corr=corAR1(0.8, form= ~1|fact_C)

Should you move definitely to R, I strongly suggest you to buy and study 
the following book

Pinheiro, J.C., and Bates, D.M. (2000) "Mixed-Effects Models in S
     and S-PLUS", Springer.

All the best

Ottorino-Luca Pantani, Università di Firenze
Dip. Scienza del Suolo e Nutrizione della Pianta
P.zle Cascine 28 50144 Firenze Italia
Tel 39 055 3288 202 (348 lab) Fax 39 055 333 273
OLPantani at unifi.it  http://www4.unifi.it/dssnp/

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