#### Title

Current Status and Right-Censored Data Structures When Observing a Marker at the Censoring Time

#### Abstract

We study nonparametric estimation with two types of data structures. In the first data structure n i.i.d. copies of (C,N (C) ) are observed, where N is a counting process jumping at time variables of interest and C a random monitoring time. In the second data structure n i.i.d. copies of (C ^ T, I(T =< C), N (C ^ T)) are observed, where N is a counting process with a final jump at time T (e.g., death). This data structure includes observing right-censored data on T and a marker variable at the censoring time.

In these data structures, easy to compute estimators, namely (Weighted)-Pool-Adjacent-Violator estimators for the marginal distributions of the unobservable time variables, and the Kaplan-Meier estimator for the time T until the final observable event, are available. These estimators ignore seemingly important information in the data. In this paper we prove that, at most continuous data generating distributions with compact support, the ad hoc estimators yield asymptotically efficient estimators of (square root of n)-estimable parameters.

#### Disciplines

Statistical Methodology | Statistical Theory | Survival Analysis

#### Suggested Citation

van der Laan, Mark J. and Jewell, Nicholas P., "Current Status and Right-Censored Data Structures When Observing a Marker at the Censoring Time" (March 2001). *U.C. Berkeley Division of Biostatistics Working Paper Series.* Working Paper 92.

http://biostats.bepress.com/ucbbiostat/paper92

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## Comments

Published 2003 in Annals of Statistics, 31, 2, 512-535.