doubcens (version 1.1)

Sunwghts: Estimate Survivor Function using Doubly Interval-Censored Left-Truncated Failure Time Data

Description

Estimates the discrete Survivor Function from doubly interval-censored left-truncated failure time data using the algorithm of Sun.

Usage

Sunwghts(Ei, Ri, Li, Ui, Bi1, Bi2)

Arguments

Ei

The left endpoint of the censoring interval for the initial event time

Ri

The right endpoint of the censoring interval for the initial event time

Li

The left endpoint of the censoring interval for the terminating event time

Ui

The right endpoint of the censoring interval for the terminating event time

Bi1

The left endpoint of the truncation interval for the terminating event time

Bi2

The right endpoint of the truncation interval for the terminating event time

Value

Sunwghts returns a list containing the following components

uj

A vector of mass points for survival lengths

fnew

A vector of estimated probabilities for uj

counter

Number of iterations required for convergence

Details

Set Ei = Ri if the initial event is observed. Set Li = Ui if the terminating event is observed. Set Ei = -INF if the initial event is left-censored. Set Ri = INF if the terminating event is right-censored.

References

Sun, J. (1995). Empirical Estimation of a Distribution Function with Truncated and Doubly Interval-Censored Data and Its Applications to AIDS Studies. Biometrics 51 (3): 1096-1104.

Examples

# NOT RUN {
test <- Sunwghts(c(1,2,1), c(4,4,4), c(5,8,9), c(5,9,10), 
		c(4.4,4.5,8), c(Inf, Inf, Inf))

# }