Re: [R] lme4 groupedData is missing

From: Deepayan Sarkar <deepayan_at_stat.wisc.edu>
Date: Sat 24 Jul 2004 - 09:22:20 EST

On Friday 23 July 2004 16:28, Jacob Wegelin wrote:

> help.search("groupedData") says that it's part of the lme4 package,
> but it appears not to be there (details below). Is this because lme4
> is new and (perhaps) still under development?

Yes, sort of. The groupedData class in nlme inherits from "data.frame". Since "data.frame" is not an S4 class, this is difficult to emulate, and we are still experimenting on how to represent grouping information. The groupedData class in lme4 is one attempt, but the current plans are to scrap it and just have the grouping information as attributes on a data frame.

It so happens that the current groupedData function is not exported, which is why you can't see it. That's an oversight on my part, but since it will probably go away anyway, this is a good thing.

Deepayan



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