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 ...
library("nlme")
fit.1<-lme(soil.moisture ~ Trenching + DaysSinceEvent,
^^^^^
+ Trenching:DaysSinceEvent,
random = ~ DaysSinceEvent | Plot,
data=Dat.middle,
method="ML"
)
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