Matt, After considerable fiddling around with getting the mode of objects right (there are still some rough spots in R), I have a working version of the tests. I had forgotten, but the 'rs' function will test any zero-sum contrast, so your paired comparisons should not be too difficult. The output is a bit voluminous, but was designed for non-specialist users. I'm still looking for the proper correction for Z-scores. Jim -------------- next part -------------- A non-text attachment was scrubbed... Name: rs.tar.gz Type: application/x-gzip Size: 2712 bytes Desc: not available Url : https://stat.ethz.ch/pipermail/r-help/attachments/19980731/5d2fb28b/rs.tar-0002.gz