odsData {ICODS}

Toy Example for ODS Design with Interval-Censored Data

Description

This data set gives a simple toy example of ODS design with interval-censored data. It was generated following the simulation study used to illustrate the method in the original manuscript referenced below. This dataset is not meaningful and is intended for demonstration purposes only.

Usage

data(odsData)

Format

A data.frame containing 501 observations with 6 columns:

U

examination time; see Details.

V

examination time; see Details.

del1

indicator of a left-censored observation I(T<=U).

del2

indicator of an interval-censored observation I(U<T<=V).

z

covariates.

ind

indicating membership of the simple random sample (0), lower-tail supplemental sample (1), or upper-tail supplemental sample (2).

Details

The data can be understood as follow. There are K follow-up examinations at times TE = (T1, T2, ..., TK), and the failure time is denoted as TF. For left-censored data, the failure occurred prior to the first follow-up examination (TF < T1); therefore, U = T1, V = tau, and (del1,del2)=(1,0). For right-censored data, the failure had not yet occurred at the last follow-up examination (TF > TK); therefore, U = 0, V = TK, and (del1,del2)=(0,0). For interval-censored data, the failure occurred between two follow-up examinations, e.g. T2 < TF < T3; therefore, U and V to be the two consecutive follow-up examination times bracketing the failure time TF and (del1,del2)=(0,1).

References

Zhou, Q., Cai, J., and Zhou, H. (2018). Outcome-dependent sampling with interval-censored failure time data. Biometrics, 74(1): 58–67. <doi:10.1111/biom.12744>