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...e least significant covariate and testing with anova, until I have minimized the model. Is there a package were this can be done? or am I doing something wrong ? (I'm not a statistician). Thanks for hints Pietro Bulian Clinical and Experimental Hematology Research Unit Centro di Riferimento Oncologico, I.R.C.C.S. Via Pedemontana, 12 I-33081 Aviano (PN) - Italy phone: +39 0434 659 412 fax: +39 0434 659 409 e-mail: pbulian@cro.it [[alternative HTML version deleted]]

At work after updating to R 2.5 I get an error using epitab from package epitools, when at home (R 2.4) I get no error. Could someone help me? Thanks Pietro Bulian Servizio di Onco-Ematologia Clinico-Sperimentale I.R.C.C.S. Centro di Riferimento Oncologico Via Franco Gallini 2 33081 Aviano (PN) - Italy phone: +39 0434 659 412 fax: +39 0434 659 409 e-mail: pbulian at cro.it (at work) epitab(matrix(c(227,473,74,126),2)) the part of the args list of 'list' being evaluated was: (tab = tab, measure = oddsratio, conf.level = conf.level, pvalu...

...om cox.zph or should I look at graphical pattern? Is age in this example violating proportionality? I paste below "eta" (age) "TTP" (time to event) "CENSOTTP" (censor) Thank you Pietro Bulian Clinical and Experimental Hematology Research Unit Centro di Riferimento Oncologico, I.R.C.C.S. Via Pedemontana, 12 I-33081 Aviano (PN) - Italy phone: +39 0434 659 412 fax: +39 0434 659 409 e-mail: pbulian@cro.it "eta" "TTP" "CENSOTTP" 71 68 0 52 29 0 49 5 1 69 136 0 79 11 0 61 1 1 56 3 1 71 52 1 61 40 1 70 51 1 58 30 0 78 52 0 65 40 0 6...