newbie question on str output

What do the nfnGroupdata, nfGroupdata mean, please?

??nfnGroupedData (not nfnGroupdata) gives some information, and tells you,
that it is related to package nlme. This package is one of the most useful
and has a good documenting book (Pinheiro/Bates), but the groupedData
concept is more confusing than helpful. I only started to understand lme and
friend until I had noted that it works without grouped data.

So better consider CO2 a simple data frame of example data, with historical
decoration. I suggest you start with 

CO2 <- as.data.frame(CO2)

Dieter

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