Abstract #302013

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JSM 2002 Abstract #302013
Activity Number: 119
Type: Luncheons
Date/Time: Monday, August 12, 2002 : 12:30 PM to 1:50 PM
Sponsor: Section on Physical & Engineering Sciences*
Abstract - #302013
Title: Length Biased Sampling in Scientific Studies
Author(s): Karen Kafadar*+
Affiliation(s): University of Colorado, Denver
Address: P.O. Box 173364, Denver, Colorado, 80217-3364,
Keywords: screening trials ; inspection programs
Abstract:

Length biased sampling arises when items are sampled in proportion to their values of a random variable X of interest; e.g., older units are more likely to be sampled simply because they have been in service longer. A difficult problem arises when this variable is not observable, but another random variable Y is observed, and Y is correlated with X, such as item degradation in a periodic inspection program or subclinical disease progression. We discuss related issues and methods of estimating the effects.

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Revised March 2002