heart {MASS} | R Documentation

## The Stanford heart transplant data

### Description

The Stanford heart transplant data from Kalbfleisch & Prentice.

### Format

A data frame with columns:

`start`
  start time in days. Either 0 or time of transplant.
`transplant`
  is this before (0) or after (1) transplantation?
`stop`
  time of transplant or death or censoring (days)
`event`
  death (1) or censored (0)
`age`
  patient's age in years at acceptance, less 48.
`year`
  date of acceptance. Actually days since 1967/10/1 divided by 365.25.
`surgery`
  prior surgery (0 = no, 1 = yes).
id
  Patient's ID

### Source

Kalbfleisch, J.D. and Prentice R.L. (1980) The Statistical Analysis of Failure Time Data.