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...and I am just missing something, suggestions about good texts or examples on R would be great. I am generating data with Scilab, I have a single matrix corresponding to each dog. But I can change it if needed. Any help would be greatly appreciated Thanks Laurent Fanchon DVM, MS Ecole Nationale Veterinaire d'Alfort France

...199 0.3576229 week21 -1.60737 0.45527 -3.5306 0.0004146 *** --- Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1 is anybody else aware of this? or did I forget something important ? Many thanks for your help. -- Emmanuel Tillard Veterinaire CIRAD-EMVT Unite de recherche 18 UMR868 Elevage des Ruminants en Regions Chaudes (ERRC) Campus ENSA-INRA 2 place Viala 34060 Montpellier cedex 1 tel: 0499612265 (fixe) 0633850598 (gsm) fax: 0467545694 e-mail: tillard at cirad.fr

...ok for mean expected survival Call: survfit.coxph(object = kfitm1) n events median 0.95LCL 0.95UCL 76 58 63 39 132 survfit(kfitm1, newdata=kidney[1,]) #return an error message Erreur dans x2 %*% coef : arguments inad?quats Thanks in Advance -- Emmanuel Tillard Veterinaire CIRAD-EMVT Unite de recherche 18 UMR868 Elevage des Ruminants en Regions Chaudes (ERRC) Campus ENSA-INRA 2 place Viala 34060 Montpellier cedex 1 tel: 0499612265 (fixe) 0633850598 (gsm) fax: 0467545694 e-mail: tillard at cirad.fr