JSM 2011 Online Program

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Abstract Details

Activity Number: 569
Type: Contributed
Date/Time: Wednesday, August 3, 2011 : 2:00 PM to 3:50 PM
Sponsor: Biometrics Section
Abstract - #300630
Title: Group Sequential Methods Based on Ranked Set Samples
Author(s): Esam Abdul-Qatar Al-Sawi*+ and Abdul K. Hussein and H. A. Muttlak
Companies: King Fahd University and University of Windsor and King Fahd University
Address: Petroleum and Minerals Department, Dhahran, International, +966, KSA
Keywords: Auxiliary information ; Group sequential methods ; Ranked set sampling ; Two-sample hypotheses
Abstract:

Ranked set sampling schemes were originally proposed to increase efficiency in estimation. On the other hand, group sequential methods provide substantial savings in sample and enable us to make decisions as early as possible. In this manuscript, we intend to combine the benefits of the two methodologies. We propose group sequential tests for one and two population means under ranked set sampling. We compare the power, average sample sizes and type I errors of the proposed tests to those of group sequential tests based on simple random sampling schemes. We illustrate the utility of the method by using data from a leukemia clinical trial.


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