Hi all, I'm trying to run some monte carlo simulation for my roll call data using the ideal() function, which resides in the pscl package. However, I'm receiving an error message that I don't understand.
Error in ideal(a, maxiter = 1000, thin = 10, burnin = 50, store.item = TRUE, : NA/NaN/Inf in foreign function call (arg 13) my code is simple the following: > m_a <- ideal(a, maxiter = 1000, thin = 10, burnin = 50, + store.item = TRUE, normalize=T, + priors=list(xp=1e-12,xpv=1e-12,bp=1e-12,bpv=1e-12), verbose=T) ideal: analysis of roll call data via Markov chain Monte Carlo methods. Subsetting rollcall object a using dropList Using the following codes to represent roll call votes: Yea: 1 Nay: 0 Abstentions: NA Not In Legislature: 9 Ideal Point Estimation Number of Legislators 30 Number of Items 1172 checking for any user-supplied priors... checking start values... will use eigen-decomposition method to get start values for ideal points...done running 1172 vote-specific probit GLMs for start values for item/bill parameters conditional on start values for ideal points...done using the following start values for ideal points (summary follows): V1 Min. :-0.7573 1st Qu.:-0.1583 Median : 0.0000 Mean :-0.0342 3rd Qu.: 0.0000 Max. : 0.8160 using the following start values for item parameters (summary follows): V1 V2 Min. :-131.2397 Min. :-49.27293 1st Qu.: -1.9090 1st Qu.: -1.33518 Median : -1.5156 Median : -0.34876 Mean : 0.5443 Mean : -0.07001 3rd Qu.: 1.6978 3rd Qu.: 1.22064 Max. : 553.5285 Max. : 65.19820 NA's : 573.0000 Starting MCMC Iterations... Error in ideal(a, maxiter = 1000, thin = 10, burnin = 50, store.item = TRUE, : NA/NaN/Inf in foreign function call (arg 13) + The problem, I think, is that many data matrix has too many NA. Does anybody have any suggestion? Thanks in advance, Antonio. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.