varlogTTC_wei: varlogTTC_wei function

In curesurv: Mixture and Non Mixture Parametric Cure Models to Estimate Cure Indicators

varlogTTC_wei function

Description

Calculates the variance of log(TTC) with delta method. The expression of this variance is expressed as: Var(log(TTC)) = (dlog(TTC)/dtheta)Var(theta)(dlog(TTC)/dtheta)^T

where Var(theta) is the variance-covariance matrix of theta.

Usage

varlogTTC_wei(
  object = object,
  z_ucured = z_ucured,
  z_pcured = z_pcured,
  epsilon = epsilon,
  TTC
)

Arguments

object	ouput from a model implemented in curesurv
z_ucured	covariates matrix acting on survival function of uncured
z_pcured	covariates matrix acting on cure proportion
epsilon	value fixed by user to estimate the TTC \text{Pi}(t)\geq (1-\epsilon). By default \epsilon = 0.05.
TTC	time to cure previsouly estimated by TTC_wei

curesurv documentation built on April 12, 2025, 2:21 a.m.