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...e-01 9.762611e-01 9.910979e-01 9.525223e-01 Should I manually calculate the U statistics interpreting the fraction "x1 more concordant" and "x2 more concordant" of the "Relevant Pairs" as Uxy and Uyx? many thanks for any help or suggestion Pietro Bulian

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 'lis...

.... This is not what I want and then I do a manual step updating the model minus the 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]]

...og Kaplan Meier, so my question is: should I always rely on significance test from 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...