[R] na.action in randomForest
Prof Brian Ripley
ripley at stats.ox.ac.uk
Mon Aug 4 10:32:37 CEST 2003
On Sun, 3 Aug 2003, David Parkhurst wrote:
> The help page for randomForest shows na.action=na.fail as a parameter, and
> does not describe other possibilities for na.action.
> I have a regression problem, with about 1000 rows in my data frame, and with
> an NA in occasional predictor variables, in about 5% of rows. I would like
> to have all rows included in the analysis, to the extent possible. (That
> seems to be possible in rpart, for example.) Is it possible to specify that
> rows with a few NA's should be included in the randomForest analysis? If
> so, how?
What do you want the tree procedure to do with NAs? Hint: rpart and tree
have two different approaches.
Brian D. Ripley, ripley at stats.ox.ac.uk
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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