ComparisonSurv (version 1.1.1)

crosspoint: Produce The Cross Time Point When Two Survival Curves Crossed Each Other

Description

A function used to produce the cross time points in two survival curves.

Usage

crosspoint(time,status,group)

Value

A list containing the following components:

crosspoint

The crossing time points between two survival curves. When there is no crossing between two survival curves, the program will stop with "There is no crossing exists".

Arguments

time

The follow up time for right censored data.

status

The status indicator, normally 1=event, 0=alive or right censored.

group

The group indicator for comparison, and the elements of this vector must take either 0 or 1. Normally, 0= control group, 1= treatment group.

Examples

#get 'Crossdata' from package
data(Crossdata)
data1<-Crossdata
#get cross point
#two survival curves crossing at 1.69 years or so
crosspoint(data1$time,data1$status,data1$group)
#
#get 'PHdata' from package
data(PHdata)
data2<-PHdata
#when there exists no crossing
#the program will stop "There is no crossing exists"
# Not run: crosspoint(data2$time,data2$status,data2$group)