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Dear all, May I ask is there any functions in R to evaluate the fitness of "coxph" and "survreg" in survival analysis, please? For example, the results from Cox regression and Parametric survival analysis are shown below. Which method is prefered and how to see that / how to compare the methods? 1. coxph(formula = y ~ pspline(x1, df = 2))

Dear all, I get stuck when i try to export the data into SPSS format/file using "write.foreign()" Do you know how to do it exactly? What i have done is 1) First i type the following code in R: df<-data.frame(id,year,res1) names(df)<-c("idcode","year","resarrvl")