Does anyone have, or know of, some S or R code to implement the sequential t-test ? The test is outlined in Kendall & Stuart vol 2A, ch 24, and a 'how to do it' with a set of tables is given in 'Design & Analysis of Industrial Experiments' ( O.L.Davies). I'm interested in obtaining/creating an Splus or R application which calculates the upper and lower curves appropriate for arbitrary choices of alpha , Beta and mean-shift. Can anyone give me any pointers ? ta Bob ............................... Robert D. Kinley Site Statistician Eli Lilly & co Speke, UK ++151 448 6347 -------------- next part -------------- An HTML attachment was scrubbed... URL: https://stat.ethz.ch/pipermail/r-help/attachments/20020308/8a420699/attachment.html