[R] lme problem

[John Logsdon]

Hi

I am trying to get to grips with lme and perhaps the euro-cent is not
dropping.  I want to define a model with some terms random and some fixed
so that:

gd<-groupedData(y~x|c,df)

defining by the group c in data frame df, whereupon

mod<-lme(y~t+f,gd,~t)

where I want the t as a random effect and the f as the fixed part. 

Without the f it works OK but when I add the f, I get an error message
from model.frame saying there is an error in the lengths.  As far as I can
see, all the lengths are the same (and I have checked it with length() of
course).

Is there an obvious reason for this?  I am probably doing something stupid
but it escapes me at the moment.  I will try and do the same with MLn this
evening ...

John

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