Daer r-helpers, Can anyone help with the following: I get: > mcmcsamp(txt.lmer3f) Markov Chain Monte Carlo (MCMC) output: Start = 1 End = 1 Thinning interval = 1 .... But: > mcsamp(txt.lmer3f) Error in as.bugs.array(sims, program = "lmer", n.iter = n.iter, n.burnin = n.burnin, : error in parameter sigma.s in parameters.to.save I had attached the arm package: > library(arm) Loading required package: R2WinBUGS arm (Version 1.0-15, built: 2007-3-17) Working directory is /Users/mk/Documents/projects/Mike/prediss/Exp-Text Loading required package: foreign > sessionInfo() R version 2.4.1 (2006-12-18) i386-apple-darwin8.8.1 locale: C attached base packages: [1] "tools" "grid" "datasets" "stats" "graphics" "grDevices" "utils" "methods" [9] "base" other attached packages: foreign arm R2WinBUGS coda Hmisc gmodels effects lme4 "0.8-18" "1.0-15" "2.0-4" "0.10-7" "3.2-1" "2.13.2" "1.0-9" "0.9975-13" Matrix car weaver codetools digest xtable latticeExtra lattice "0.9975-11" "1.2-1" "1.0.1" "0.0-3" "0.2.3" "1.4-3" "0.1-4" "0.14-17" gridBase MASS JGR iplots JavaGD rJava "0.4-3" "7.2-33" "1.4-15" "1.0-5" "0.3-6" "0.4-14" Thanks, MK _____________________________ Professor Michael Kubovy University of Virginia Department of Psychology USPS: P.O.Box 400400 Charlottesville, VA 22904-4400 Parcels: Room 102 Gilmer Hall McCormick Road Charlottesville, VA 22903 Office: B011 +1-434-982-4729 Lab: B019 +1-434-982-4751 Fax: +1-434-982-4766 WWW: http://www.people.virginia.edu/~mk9y/