Re: [R] learning networks with a large number of variables and pre-set parents.

From: zhihua li <lzhtom_at_hotmail.com>
Date: Sat 26 Mar 2005 - 17:08:57 EST


Sorry, I didn't mean to break the posting rules. I just thought that r-help and r-sig-gr are two seperate mailing list. And the reason I posted my messages twice within 24 hours was that I forgot to add subjects to my first postings, so I'm afraid my first postings would be ignored at all. Thank you.

>From: Achim Zeileis <Achim.Zeileis@wu-wien.ac.at>
>To: zhihua li <lzhtom@hotmail.com>
>CC: r-help@stat.math.ethz.ch

>Subject: Re: [R] learning networks with a large number of variables and
pre-set parents.
>Date: Fri, 25 Mar 2005 11:40:46 +0100 (CET)
>
>This is the second time within 24 hours that you cross-posted the same
>question to two of the R mailing lists, please read the posting guide
>linked at the bottom of this mail on how to properly ask your questions.
>
>As for your question: I'm not aware of an R package that would be able to
>do what you are looking for, but you might also ask the maintainer of the
>package you're specifically interested in for more details.
>Z
>
>
>
>On Fri, 25 Mar 2005, zhihua li wrote:
>
> > hi netters:
> >
> > I have a series of discrete variables which form a network and I want
to
> > learn the network structure from some training data. I could have used
> > packages like deal but there are two problems.
> >
> > First of all, I have 10000 variables. So the possible network structure
is
> > awfully huge, I don't know how long it will take my PC to find the
> > highest-scoring network..........maybe a month?
> > Secondly, I have some prior knowledge that only 500 out of the 10000
> > variales are possible parents. In another word, only those arrows
startting
> > from the 500 variables and pointing to the remaining 99500 variables
are
> > allowed in the network. In deal an assignment to "banlist" should help
me
> > rule out the impossible arrows. But in my case the number of
"impossible
> > arrows" is 500*499+99500*99549, and so the "banlist" would get
> > unacceptable long. Are there any methods (in deal or other packages) to
> > specify the parents set in advance?
> >
> > Thanks a lot!
> >
> > ______________________________________________
> > R-help@stat.math.ethz.ch mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
> >



R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat Mar 26 17:21:31 2005

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