format
bladder
ll{
id: Patient id
rx: Treatment 1=placebo 2=thiotepa
number: Initial number of tumours (8=8 or more)
size: size (cm) of largest initial tumour
stop: recurrence or censoring time
enum: which recurrence (up to 4)
}
bladder2
ll{
id: Patient id
rx: Treatment 1=placebo 2=thiotepa
number: Initial number of tumours (8=8 or more)
size: size (cm) of largest initial tumour
start: start of interval (0 or previous recurrence time)
stop: recurrence or censoring time
enum: which recurrence (up to 4)
}source
Wei, Lin, Weisfeld, JASA 1989