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Article
Reducing Sample Size Needed for Cox-Proportional hazards model Analysis Using More Efficient Sampling Method
Communication of Statistics: Theory and Methods
  • Hani Samawi, Georgia Southern University, Jiann-Ping Hsu College of Public Health
  • Lili Yu, Georgia Southern University, Jiann-Ping Hsu College of Public Health
  • Haresh Rochani, Georgia Southern University, Jiann-Ping Hsu College of Public Health
  • Robert Vogel, Georgia Southern University, Jiann-Ping Hsu College of Public Health
Document Type
Article
Publication Date
12-31-2018
DOI
10.1080/03610926.2018.1554141
Abstract

In general, survival data are time-to-event data, such as time to death, time to appearance of a tumor, or time to recurrence of a disease. Models for survival data have frequently been based on the proportional hazards model, proposed by Cox. The Cox model has intensive application in the field of social, medical, behavioral and public health sciences. In this paper we propose a more efficient sampling method of recruiting subjects for survival analysis. We propose using a Moving Extreme Ranked Set Sampling (MERSS) scheme with ranking based on an easy-to-evaluate baseline auxiliary variable known to be associated with survival time. This paper demonstrates that this approach provides a more powerful testing procedure as well as a more efficient estimate of hazard ratio than that based on simple random sampling (SRS). Theoretical derivation and simulation studies are provided. The Iowa 65+ Rural study data are used to illustrate the methods developed in this paper.

Citation Information
Hani Samawi, Lili Yu, Haresh Rochani and Robert Vogel. "Reducing Sample Size Needed for Cox-Proportional hazards model Analysis Using More Efficient Sampling Method" Communication of Statistics: Theory and Methods Vol. 49 Iss. 6 (2018) p. 1281 - 1298 ISSN: 1532-415X
Available at: http://works.bepress.com/hani_samawi/269/