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Hi, How to perform a stepwise selection of the best models for gee? Why can't step() do this job? Thanks. Sincerely Yours, Jinn-Yuh Guh, M.D. Dept. of Internal Medicine Kaohsiung Medical College 100 Shi-Chuan 1st Road Kaohsiung, Taiwan FAX: 886-7-312-2810 e-mail: jyuh at mail.nsysu.edu.tw -------------- next part -------------- An HTML attachment was scrubbed... URL: https://stat.ethz.ch/pipermail/r-help/attachments/20000411/687a45df/attachment.html

...changeable" "AR-M" "unstructured" What does each term mean? How do I choose among them? How do I know the correlation structure of my repeated measures data? Can non-normally distributed X1, X2 be used? Thank you very much. Sincerely, Jinn-Yuh Guh Kaohsiung Medical Colege jyuh at mail.nsysu.edu.tw -------------- next part -------------- An HTML attachment was scrubbed... URL: https://stat.ethz.ch/pipermail/r-help/attachments/20000318/4617966b/attachment.html

.../(1+(x/c)) Error in model.frame(formula, rownames, variables, varnames, extras, extranames, : variable lengths differ Why? Thanks! Sincerely Yours, Jinn-Yuh Guh, M.D. Dept. of Internal Medicine Kaohsiung Medical College 100 Shi-Chuan 1st Road Kaohsiung, Taiwan FAX: 886-7-312-2810 e-mail: jyuh at mail.nsysu.edu.tw -------------- next part -------------- An HTML attachment was scrubbed... URL: https://stat.ethz.ch/pipermail/r-help/attachments/20000404/827026da/attachment.html