[R] missing values imputation

[Liaw, Andy]

> From: Rolf Turner
> 
> Anne Piotet wrote:
> 
> > What R functionnalities are there to do missing values imputation
> > (substantial proportion of missing data)?  I would prefer to use
> > maximum likelihood methods ; is the EM algorithm implemented? in
> > which package?
> 
> 	The so-called ``EM algorithm'' is ***NOT*** an
> 	algorithm.  It is a methodology or a unifying concept.
> 	It would be impossible to ``implement'' it.  (Except
> 	possibly by means of some extremely advanced and
> 	sophisticated Artificial Intelligence software.)

Yes, but EM for missing value imputation is a bit narrower, I guess.  At
least the `norm' package on CRAN has em.norm() for multivariate gaussian...

Andy

 
> 				cheers,
> 
> 					Rolf Turner
> 					rolf at math.unb.ca
> 
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