Observational data on survival times of renal failure patients receiving
   peritoneal dialysis.

   Column 1: patient identifier
   Column 2: survival time (days since start of treatment, may be censored)
   Column 3: censoring indicator: if 0, patient was still alive after number
             of days indicated in column 2; if 1, patient died after number
             of days indicated in column 2
   Column 4: dialysis method: 0 for CAPD (Continuous Ambulatory Peritoneal 
             Dialysis), 1 for APD (Automated Peritoneal Dialysis)
   Column 5: age (in years at start of treatment)