Hi all, I am trying to fit a survival analysis to determine effect of two factors on survival, factors have 3 and 5 levels respectively. N is 1050 and experiment is balanced. I have used "survival" package for analyses. I have problems in select the best survival model for my data, I fit several parametric models (weibull, expontential, gaussian, lognormal, loglogistic, logistic) and a Cox model. Model selection was made by AICc being Cox model the best option by this criteria, but I am not sure that AIC is valid to compare parametric and non-parametric survival models. Moreover, my data violates the proportional hazards assumption of Cox models. For all of this, I don't know what model select. Thanks in advanced Diego Salazar
Diego Francisco Salazar Tortosa
Phd. student
Departamento de Ecolog?a
Facultad de Ciencias
Universidad de Granada
Av. Fuente Nueva s/n
18071 Granada
Telefono: +34 958241000 ext 20007
Movil: +34 634851132
email:dsalazar at ugr.es
dftortosa at gmail.com