The data was colleceted to test a laser treatment for delaying blindness in patients with dibetic retinopathy. The subset of 197 patiens given in Huster et al. (1989) is used.
This data frame contains the following columns:
a numeric vector. Patient code.
a numeric vector. Age of patient at diagnosis.
a numeric vector. Survival time: time to blindness or censoring.
a numeric vector code. Survival status. 1: blindness, 0: censored.
a numeric vector code. Random eye selected for treatment. 1: left eye 2: right eye.
a numeric vector. 1: treatment 0: untreated.
a numeric vector code. 1: younger than 20, 2: older than 20.
Huster W.J. and Brookmeyer, R. and Self. S. (1989) MOdelling paired survival data with covariates, Biometrics 45, 145-56.