Hello, running the code simulatedCase <- rbinom(100,1,0.5) simDf <- data.frame(CASE = simulatedCase) posterior_m0 <<- MCMClogit(CASE ~ 1, data = simDf, b0 = 0, B0 = 1) always results in an acceptance ratio of 0. If I do not specify b0 and B0, this does not occur. I do not understand the reasons for this behaviour - any explanation would be greatly appreciated! Thanks, Alexander -- View this message in context: http://www.nabble.com/MCMClogit-confusion-tp25777754p25777754.html Sent from the R help mailing list archive at Nabble.com.