s2pwe {gsDesign2}

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))