On Tue, 21 Jun 2005, Douglas Bates wrote:
On 6/21/05, Søren Højsgaard <[EMAIL PROTECTED]> wrote:
The problem with simulate.lme is that it only returns logL for a given model
fitted to a simulated data set - not the simulated data set itself (which one
might have expected a function with that name to do...). It would be nice with
that functionality...
Søren
You could add it. You just need to create a matrix that will be large
enough to hold all the simulated data sets and fill a column (or row
if you prefer but column is probably better because of the way that
matrices are stored) during each iteration of the simulation and
remember to include that matrix in the returned object.
Note: you don't need to store it: you can do the analysis at that point
and return the statistics you want, rather than just logL.
I did say `see simulate.lme', not `use simulate.lme'. I know nlme is no
longer being developed, but if it were I would be suggesting/contributing
a modification that allowed the user to specify an `extraction' function
from the fit -- quite a few pieces of bootstrap code work that way.
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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