[R] Error Message: MCMCpack and coda

Andrew D. Martin admartin at wustl.edu
Mon Nov 1 20:35:49 CET 2004


This is a problem with coda's mcmc summary method.  I suspect it is in 
the spectrum0() call therein, but I don't know for sure.

For your immediate purposes you could extract the posterior density 
sample as a matrix from the mcmc object and manually compute quantities 
of interest.


On Oct 31, 2004, at 3:15 PM, rbest1 at binghamton.edu wrote:

> Hello All,
> I'm trying to run a one-dimenional irt model using the packages MCMC 
> and
> coda on a rather large set of roll-call voting data with many missing
> observations.  Here's a sample of the code:
> Post10<-
> MCMCirt1d (Italy10, burnin = 1000, mcmc=50000, thin=100, verbose=TRUE,
> theta.constraints = list(V549=1, V443=-1))
> The MCMCirt1d command seems to work fine, but when I try to summarize 
> the
> output I get the following error message(s):
> summary(Post10)
> Error: NA/NaN/Inf in foreign function call (arg 1)
> In addition: Warning message:
> Step size truncated due to divergence
> My understanding is that this has something to do with the missing 
> data,
> though I don't know how to address this issue.  Any help would be 
> greatly
> appreciated.
> Thank you,
> Robin Best
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Andrew D. Martin, Ph.D.
Department of Political Science
Washington University
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