s2pwe: Approximate survival distribution with piecewise exponential...
In evettek/ek-test: Group Sequential Design Under Non-Proportional Hazards

s2pwe converts a discrete set of points from an arbitrary survival distribution to a piecewise exponential approximation

1	s2pwe(times, survival)

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

A tibble containing the duration and rate.

The contents of this section are shown in PDF user manual only.#' @return A tibble with duration and 'rate'

# 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))

evettek/ek-test documentation built on Dec. 20, 2021, 6:47 a.m.

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