[R] lme function cannot find object

Ben Bolker bbolker at gmail.com
Thu Jun 6 14:35:54 CEST 2013

Pfeiffer, Steven <pfeiffss <at> miamioh.edu> writes:

> I have been using the function lme() from package 'nlme' for several months
> now without any problems.  Suddenly, it cannot find a factor in my data.
> Is this a new bug of some kind?  My code and output are below.
> Thanks for your help!
> -Steve Pfeiffer

  You have an extra comma at the end of the first line of
your lme code (indicated with ^^^), so R thinks your interaction term is a
separate argument and tries to intepret it outside the context
of the formula ...

fit.1<-lme(soil.moisture ~ Trenching + DaysSinceEvent,
                                         + Trenching:DaysSinceEvent,
                 random = ~ DaysSinceEvent | Plot,

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