Hi, I made a survival analysis using survreg function. Its OK. But, I need to show in the graph 1-weibull curves. Ploting weibull curve a add the estimated points following these steps: fit <- survfit(Surv(Time,Censor)~Group) points(fit[1]) points(fit[2]) points(fit[3]) I have 3 groups. But I dont know how to plot the correct points on a inverse weilbull graph. I try to use points(1-fit[1]) but dont work. I try others way to make this, but all dont make sense. Anybody can help me? Thanks Ronaldo --> Prof. Ronaldo Reis J?nior| .''`. UNIMONTES/Depto. Biologia Geral/Lab. Ecologia Evolutiva | : :' : Campus Universit?rio Prof. Darcy Ribeiro, Vila Mauric?ia | `. `'` CP: 126, CEP: 39401-089, Montes Claros - MG - Brasil | `- Fone: (38) 3229-8190 | chrysopa em gmail.com | ICQ#: 5692561 | LinuxUser#: 205366