The data has 408 rows and 5 columns.
- cause
 
a numeric vector code. 
Survival status. 1: dead from treatment related causes, 
2: relapse , 0: censored.
- time
 
a numeric vector. Survival time.
- platelet
 
a numeric vector code. Plalelet 
1: more than 100 x \(10^9\) per L, 0: less.
- tcell
 
a numeric vector. T-cell depleted BMT 1:yes,
0:no.
- age
 
a numeric vector code. Age of patient, scaled and
centered ((age-35)/15).