[R] Replacing missing values

Prof Brian D Ripley ripley at stats.ox.ac.uk
Tue May 8 20:36:39 CEST 2001

On Tue, 8 May 2001, Jean Vidal wrote:

> I'm discovering R (very impressive), and didn't find in the docs a simple
> method for replacing, in a data frame, missing values (NA) with the
> column's mean (or any other method for reconstructing missing values when
> needed).

That's the purpose of na.action's, except that mean imputation is not
a great idea.  If you look at na.omit it would be easy to write
na.mean.impute if you really want to.

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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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