s_piecewise {survobj}

Factory of SURVIVAL objects with Piecewise Exponential distributions

Description

Creates a SURVIVAL object with an Piecewise Exponential distribution.

Usage

s_piecewise(...)

Arguments

...

Parameters to define the distribution. See the Parameters for details

Value

a SURVIVAL object of the piecewise exponential distribution family. See the documentation of s_factory for the methods available for SURVIVAL objects

Parameters

To create an piecewise exponential survival object the following options are available:

breaks and hazards to specify the exponential (constant) hazard until each break, or

surv, breaks and segments for the proportion surviving (no events) at the end of last segment or

fail, breaks and segments for the proportion failing (events) at the end of last segment

If surv or fail parameters are indicated, the segments are scaled to hazards in order to mach the surviving or failing proportion at the end of the last segment.

Define the last break point as Inf to fully define the distribution, otherwise an error will be produce if function after the last break is requested

The parameters should be spell correctly as partial matching is not available

Examples

s_piecewise(breaks = c(1,2,3,Inf), hazards = c(0.5,0.6,0.5,0.1))
s_piecewise(surv = 0.4, breaks = c(1,2,3,Inf), segments = c(1,2,1,2))
s_piecewise(fail = 0.6, breaks = c(1,2,3,Inf), segments = c(1,2,1,2))