baseline_hazard: Baseline Hazard and Cumulative Hazard Evaluation

In MultiFrailty: Shared Frailty Regression Models with Inverse Gaussian, Generalized Lindley, and Gamma Frailty Distributions

Baseline Hazard and Cumulative Hazard Evaluation

Description

Computes baseline hazard phi0(t) and cumulative baseline hazard Phi0(t) for Weibull and Generalized Weibull (GW) distributions.

Usage

baseline_hazard(t, baseline = c("weibull", "gw"), par)

Arguments

t	Positive numeric vector of time points.
baseline	Character string specifying baseline distribution: "weibull" or "gw".
par	Numeric vector of parameters: c(lambda, gamma) for Weibull, or c(delta, zeta, xi) for GW.

Value

A named list with components:

H0	Cumulative baseline hazard Phi0(t).
h0	Baseline hazard phi0(t).

References

Mudholkar, G. S., & Srivastava, D. K. (1993). Exponentiated Weibull family for analyzing bathtub failure-rate data. IEEE Transactions on Reliability, 42(2), 299-302.

Examples

bh_weib <- baseline_hazard(1:5, baseline = "weibull", par = c(2, 1.5))
bh_gw <- baseline_hazard(1:5, baseline = "gw", par = c(0.5, 1.2, 1.1))

MultiFrailty documentation built on Aug. 8, 2026, 1:07 a.m.