search for: dft12

...ame with Surv object df.test <- data.frame(survobj, group); df.test; str(df.test) ## split in two data frames dft1 <- df.test[1:3,]; dft1; str(dft1); class(dft1$survobj) # class is Surv dft2 <- df.test[4:5,]; dft2; str(dft2); class(dft2$survobj) # class is Surv ## rbind in one data.frame dft12 <- rbind(dft1, dft2); dft12; str(dft12); class(dft12$survobj) # class is matrix ## merge in one data.frame dft12merge <- merge(dft1, dft2, all=TRUE, sort=FALSE) dft12merge; str(dft12merge); class(dft12merge$survobj) # class is matrix