[R] newbie question on str output

[Dieter Menne]

Laura Smith wrote:
> 
> 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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