Dear R/Bioconductor users I'm trying to find a package to perform a Dunnett's test comparing the response from a large number of groups to a single control group. I have tried the "multcomp" package, but when I try to print the summary, I receive the following message: "Error in mvt(lower = carg$lower, upper = carg$upper, df = df, corr = carg$corr, : only dimensions 1 <= n <= 1000 allowed" I have also looked into the simTest package, but some comments on the R mailing lists says that simTest only constructs the Dunnett's contrasts but does not perform a Dunnett's test. Are there any packages available to do this? Thank you! Jason -- output of sessionInfo(): LM<-aov(NormalizedGrowth~siRNA,dat); library(multcomp); ht <- glht(LM, linfct = mcp(siRNA = "Dunnett")) > summary(ht) Error in mvt(lower = carg$lower, upper = carg$upper, df = df, corr = carg$corr, : only dimensions 1 <= n <= 1000 allowed -- Sent via the guest posting facility at bioconductor.org.