I'm getting an error while using webbioc in the multtest step. All works fine when doing a two-sample t-test (equal or unequal variances) and choosing "abs" or "upper" as Rejection region. However when choosing "lower" I get the following error back: Error in pt(teststat, df1, df2, lower.tail = FALSE) : Object "df1" not found After looking a bit into the R code that webbioc is using it seems that the error is in the mt.wrapper function of the multtest package. It should only use one "df" and not "df1" and "df2" when doing the two-sample t-test. But it looks like for "lower" is using both "df1" and "df2" while is alright for "upper" and "abs". Is this a bug? Or am I missing something? Versions are: Linux RedHat 8 R 1.8.0 webbioc 0.2 multtest 1.3.1 Thanks in advance Jose -- Jose Duarte MRC Functional Genetics Unit Department of Human Anatomy and Genetics University of Oxford South Parks Road Oxford OX1 3QX Phone: +44 (0)1865 282650 e-mail: jose.duarte@anat.ox.ac.uk