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

[zhihua li]

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 at wu-wien.ac.at>
>To: zhihua li <lzhtom at hotmail.com>
>CC: r-help at 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!
> >
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> > PLEASE do read the posting guide! 
http://www.R-project.org/posting-guide.html
> >