Hello R group Do you know if an EM algorithm exits for R to estimate missing data in a sample? I just found knn algorithm in to the package emv but it doesn't look to be the usual EM algorithm. Thanks Xavier -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
Not sure if this is what you want: From the help page for the function
`em.norm' in the package `norm':
EM algorithm for incomplete normal data
Description:
Performs maximum-likelihood estimation on the matrix of incomplete
data using the EM algorithm. Can also be used to find a posterior
mode under a normal-inverted Wishart prior supplied by the user.
Andy
> -----Original Message-----
> From: Xavier.Abulker at fimat.com [mailto:Xavier.Abulker at fimat.com]
> Sent: Friday, July 26, 2002 11:51 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] estimating missing data
>
>
> Hello R group
>
> Do you know if an EM algorithm exits for R to estimate
> missing data in a
> sample?
> I just found knn algorithm in to the package emv but it
> doesn't look to be
> the usual EM algorithm.
> Thanks
> Xavier
>
> -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.
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The knn algorithm imputes the missing value by finding k-closest/similiar (Euclidean or correlation) rows. Should be useful for genetic data whereby genes (rows) that are co-regulated have the similiar expression profiles. ?knn gives you reference to paper that compare this method with SVDimpute and row averages. There is a library called 'missing' in S-PLUS which does EM besides many other fairly involved multiple imputation algorithms. It comes supplied with a 170 page help manual. But I know of no similiar versions in R. Sorry if this isn't very helpful. Adai. ----- Original Message ----- From: <Xavier.Abulker at fimat.com> To: <r-help at stat.math.ethz.ch> Sent: Friday, July 26, 2002 4:50 PM Subject: [R] estimating missing data> Hello R group > > Do you know if an EM algorithm exits for R to estimate missing data in a > sample? > I just found knn algorithm in to the package emv but it doesn't look to be > the usual EM algorithm. > Thanks > Xavier > > -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-> r-help mailing list -- Readhttp://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html> Send "info", "help", or "[un]subscribe" > (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch >_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._. _._>-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._