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Hi List,

I want to sample a multinomial distribution phi of latent variables l
given i, which is also used the other way round to sample i given l.

My idea is to create two distributions
	phi = p(l|i)
	psi = p(i|l)

of which psi is implemented by a logical node

      phi[i,1:L] ~ ddirch(phi.param[])

      for(i in 1:N) {
         psi[l,i] <- phi[i,l] / sum(phi[1:I,l])
      }

Compilation and GenInit works fine, but during the first iteration of
updating I get the following error message (on the status bar)

"update error for node phi[1,1] algorithm UpdaterDirichletpriot.Updater
error can not sample node  too many iteraitions"

Any ideas on what exactly the problem is? Is this construction supported
by OpenBUGS?

I am using OpenBUGS 2.2.0 (Feb06) on WinXP.

Thanks in advance,
	Laura

-- 
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Laura Dietz, Dipl.-Inform.
PhD Candidate
Knowledge Management Group
Department of Computer Science
Humboldt-Universität zu Berlin
Rudower Chaussee 25, 12489 Berlin
E-mail: [log in to unmask]
http://www.informatik.hu-berlin.de/~dietz
http://www.informatik.hu-berlin.de/wm
------------------------------------------------------

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