fit_bd_aft: Fit Beta-Danish AFT Regression Model

In BetaDanish: The Beta-Danish Distribution for Lifetime Data Analysis

Fit Beta-Danish AFT Regression Model

Description

Fits an Accelerated Failure Time (AFT) regression model using the Complementary Exponentiated Danish (CED) baseline (Beta-Danish with a=1).

Usage

fit_bd_aft(formula, data, n_starts = 10, method = "BFGS")

Arguments

formula	A survival formula (e.g., 'Surv(time, status) ~ age + treatment').
data	A data frame containing the variables.
n_starts	Integer; number of random starts for optimization.
method	Optimization method passed to 'maxLik'.

Details

To ensure identifiability, the shape parameter 'a' is fixed to 1. The scale parameter 'k' is linked to covariates via 'k_i = exp(X_i Positive coefficients in 'delta' indicate a larger 'k', which corresponds to shorter survival times (accelerated failure).

Value

An object of class 'bd_aft'.

BetaDanish documentation built on May 20, 2026, 5:07 p.m.