ehreg function

Fitting Extended Hazard Models

Function to fit Extended Hazard (EH) models.

ehreg(formula, data, baseline = "weibull", dist = NULL, init = 0, ...)

Arguments

• formula: an object of class "formula" (or one that can be coerced to that class): a symbolic description of the model to be fitted.
• data: data an optional data frame, list or environment (or object coercible by as.data.frame to a data frame) containing the variables in the model. If not found in data, the variables are taken from environment(formula), typically the environment from which function is called.
• baseline: the chosen baseline distribution; options currently available are: exponential, weibull, lognormal, loglogistic and Birnbaum-Saunders (fatigue) distributions.
• dist: alternative way to specify the baseline distribution (for compatibility with the survreg function); default is NULL.
• init: initial values specification (default value is 0); see the detailed documentation for init in optimizing.
• ...: further arguments passed to other methods.

Returns

ehreg returns an object of class "ehreg" containing the fitted model.

Examples

library(survstan)
fit <- ehreg(Surv(futime, fustat) ~ ecog.ps + rx, data = ovarian, baseline = "weibull")
summary(fit)