[R-sig-ME] Is anyone using the lmList() function in the lme4 package?

Hadley Wickham hadley at rice.edu
Sat Jun 26 23:52:58 CEST 2010

I would argue that it should be removed because it's pretty trivial to
replace with a combination of split and lapply, or if you prefer,
dlply from plyr.


On Saturday, June 26, 2010, Douglas Bates <bates at stat.wisc.edu> wrote:
> When we wrote the nlme package we tried to be very careful about
> starting estimates and created the lmList function to allow evaluation
> of coefficients from within-group linear fits.  It turns out that it
> is most useful for longitudinal data where there are enough
> observations on each subject to do within-subject fits; that is, for
> data like the sleepstudy data.  Subsequent developments have made it
> easy enough to fit the mixed model reliably without needing a lot of
> preliminary work to get starting estimates.  (Similarly, the
> groupedData class was a good idea at the time but no longer
> necessary.)
> Would anyone miss the lmList function if it was removed from future
> versions of lme4?
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Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University

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