s2pwe: Approximate survival distribution with piecewise exponential...
In gsDesign2: Group Sequential Design with Non-Constant Effect

s2pwe

R Documentation

Approximate survival distribution with piecewise exponential distribution

Description

Converts a discrete set of points from an arbitrary survival distribution to a piecewise exponential approximation.

Usage

s2pwe(times, survival)

Arguments

`times`	Positive increasing times at which survival distribution is provided.
`survival`	Survival (1 - cumulative distribution function) at specified `times`.

Value

A tibble containing the duration and rate.

Specification

The contents of this section are shown in PDF user manual only.

Examples

# Example: arbitrary numbers
s2pwe(1:9, (9:1) / 10)
# Example: lognormal
s2pwe(c(1:6, 9), plnorm(c(1:6, 9), meanlog = 0, sdlog = 2, lower.tail = FALSE))

gsDesign2 documentation built on April 3, 2025, 9:39 p.m.