[R] coef(summary) and plyr

David Winsemius dwinsemius at comcast.net
Mon Aug 9 19:41:40 CEST 2010

On Aug 9, 2010, at 12:47 PM, Hadley Wickham wrote:

>> There is one further improvement to consider. When I tried using  
>> dlply to
>> tackle a problem on which I had been bashing my head for the last  
>> three days
>> and it gave just the results I had been looking for, I also noticed  
>> that the
>> dlply function returns the grouping variable levels in an attribute,
>> "split_labels", which could be unlisted to use as an argument to  
>> the rep()
>> call I suggested earlier:
>> dfdl$group=rep(unlist(attr(dl, "split_labels")), each=4)
>> That might make the results more self-documenting in situations  
>> where the
>> grouping levels were more involved than 0:2.
> That's exactly what dlply does - so you should never have to do that  
> yourself.

I'm unclear what you are saying. Are you saying that the plyr function  
_should_ have examined the objects in that list and determined that  
there were 4 rows and properly labeled the rows to indicate which list  
they came from?

> "
> Hadley
> -- 
> Assistant Professor / Dobelman Family Junior Chair
> Department of Statistics / Rice University
> http://had.co.nz/

David Winsemius, MD
West Hartford, CT

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