s2pwe: Approximate survival distribution with piecewise exponential...

In keaven/gsDesign2: Group Sequential Design with Non-Constant Effect

Approximate survival distribution with piecewise exponential distribution

Description

s2pwe 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.#' @return A tibble with duration and 'rate'

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))

keaven/gsDesign2 documentation built on Oct. 13, 2022, 8:42 p.m.