landpred (version 1.2)

Wi.FUN: Computes the inverse probability of censoring weights for a specific t0 and tau

Description

Computes the inverse probability of censoring weights for a specific t0 and tau i.e. this computes I(t0 < XL < t0+tau)*DL/G(XL) + I(XL>t0+tau)/G(t0+tau) where XL = min(TL, C), TL is the time of the long term event, C is the censoring time, DL =1*(TL<C) and G() is the estimate survival probability for censoring estimated using the Kaplan Meier estimator (see Ghat.FUN)

Usage

Wi.FUN(data, t0, tau, weight.given = NULL)

Value

Inverse probability of censoring weight.

Arguments

data

n by k matrix, where k>= 2. A data matrix where the first column is XL = min(TL, C) where TL is the time of the long term event, C is the censoring time, and the second column is DL =1*(TL<C)

t0

the landmark time..

tau

the residual survival time for which probabilities are calculated.

weight.given

an optional weight to be incorporated in estimation of this weight

Author

Layla Parast

Examples

data(data_example_landpred)
t0=2
tau = 8

W2i <- Wi.FUN(data_example_landpred[,1],data = data_example_landpred[,c(1:2)],t0=t0,tau=tau)