To whom it may concern, I am trying estimate the percentage of Mormons in Utah who voted republican across time in gubernatorial, senatorial, presidential, and attorney general elections. I have data sets for nearly every election dating back to 1960. These data sets report the proportion of Mormons out of the total population at the county level for every county in Utah. The data sets also report the proportion of voters who voted republican at the same county level and the total number of voters in each county. For the majority of the data sets, the "ei" program has worked fine. However, for two of the data sets, the "ei" program reports an error message that I haven't figured out. The error message appears after the "dbuf<-ei()" command. Here is the exact text (the first three lines appear just before the error message): [1] "Running 2x2 ei" Maximizing likelihood Importance Sampling.. Error in if (any(lower > upper)) stop("lower>upper integration limits") : missing value where TRUE/FALSE needed To further clarify my problem, I've attached a data set for which "ei" worked fine--"2000Attgen.csv"--and a data set for which "ei" reported the above error message--"2004Attgen.csv". You can upload these files into R and then run the commands in the attached "Commands.R" script file. The "Printout from commands.R" script file presents the printout I see when I run the same commands I've attached. My questions are: What exactly is the error message telling me? And how do I fix the error? Thank you in advance for your assistance. Please feel free to respond to this e-mail address if you have further questions. Regards, Brian Reed Research Fellow Center for the Study of Elections and Democracy (CSED) Brigham Young University - --- EI mailing list served by HUIT Subscribe/Unsubscribe: http://lists.gking.harvard.edu/mailman/listinfo/ei More info on ei and eiR: http://GKing.Harvard.edu/eiR EI mailing list EI(a)lists.gking.harvard.edu https://lists.gking.harvard.edu/mailman/listinfo/ei