kidney               package:survival               R Documentation

Kidney data from survival5

Description:

     Data on the recurrence times to infection, at the point of
     insertion of the catheter, for kidney patients using portable
     dialysis equipment. Catheters may be removed for reasons other
     than infection, in which case the observation is censored.  Each
     patient has exactly 2 observations.

Format:


       patient:  id
       time:     time
       status:   event status
       age:      in years
       sex:      1=male, 2=female
       disease:  disease type (0=GN, 1=AN, 2=PKD, 3=Other)
       frail:    frailty estimate from original paper

Note:

     The original analysis had incorrect handling of ties and so is not
     exactly reproduced by survival.

Source:

     CA McGilchrist, CW Aisbett (1991), Regression with frailty in
     survival analysis.  _Biometrics_ *47*, 461-66.

Examples:

     kfit <- coxph(Surv(time, status)~ age + sex + disease + frailty(id), kidney)
     kfit0 <- coxph(Surv(time, status)~ age + sex + disease, kidney)
     kfitm1 <- coxph(Surv(time,status) ~ age + sex + disease + 
                     frailty(id, dist='gauss'), kidney)

