pwexploglik: Profile Log-Likelihood Function for the Change Points in...

In lrstat: Power and Sample Size Calculation for Non-Proportional Hazards and Beyond

Profile Log-Likelihood Function for the Change Points in Piecewise Exponential Approximation

Description

Obtains the profile log-likelihood function for the change points in the piecewise exponential approximation to a survival function.

Usage

pwexploglik(tau, S, ...)

Arguments

tau	The numeric vector of change points.
S	The survival function of a univariate survival time.
...	Additional arguments to be passed to S.

Value

A list with the following three components:

• piecewiseSurvivalTime: A vector that specifies the starting time of piecewise exponential survival time intervals.

• lambda: A vector of hazard rates for the event. One for each analysis time interval.

• loglik: The value of the profile log-likelihood.

Author(s)

Kaifeng Lu, [e-mail]

Examples

pwexploglik(tau = c(0.5, 1.2, 2.8), pweibull,
            shape = 1.37, scale = 1/0.818, lower.tail = FALSE)

lrstat documentation built on Oct. 18, 2024, 9:06 a.m.