Hi there,
in my code for coxph, i am keep getting the error that Tstart and tstop are of different length, despite the number of rows are same in tstart, tstop, and event. Can someone advide how to solve this?
Thank you.
tstart<-rep(0,nrow(emp))
tstop<-emp[,paste0("egfr40_esrd","rd")]
event<-emp[,"egfr40_esrd"]
model<-coxph(Surv(tstart,tstop,event)~sbp+hba1c+ln_uacr+hb+weight+hdl+ldl+ua+alb+k,data=emp)
model<-coxph(Surv(tstart,tstop,event~sbp+hba1c+ln_uacr+hb+weight+hdl+ldl+ua+alb+k),data=emp)
Error in Surv(tstart, tstop, event ~ sbp + hba1c + ln_uacr + :
Start and stop are different lengths