Volume 50, Issue 2
Statistical Methods in Epidemiology

Testing the Ratio of Two Poisson Rates

Kangxia Gu

Department of Statistical Science, Southern Methodist University, 3225 Daniel Avenue PO Box 750332, Dallas, Texas 75275‐0332, USA

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Hon Keung Tony Ng

Corresponding Author

E-mail address: ngh@mail.smu.edu

Department of Statistical Science, Southern Methodist University, 3225 Daniel Avenue PO Box 750332, Dallas, Texas 75275‐0332, USA

Phone: +1‐214‐768‐2465, Fax: +1‐214‐768‐4035Search for more papers by this author
Man Lai Tang

Department of Mathematics, Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong

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William R. Schucany

Department of Statistical Science, Southern Methodist University, 3225 Daniel Avenue PO Box 750332, Dallas, Texas 75275‐0332, USA

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First published: 28 March 2008
Citations: 38

Abstract

In this paper we compare the properties of four different general approaches for testing the ratio of two Poisson rates. Asymptotically normal tests, tests based on approximate p ‐values, exact conditional tests, and a likelihood ratio test are considered. The properties and power performance of these tests are studied by a Monte Carlo simulation experiment. Sample size calculation formulae are given for each of the test procedures and their validities are studied. Some recommendations favoring the likelihood ratio and certain asymptotic tests are based on these simulation results. Finally, all of the test procedures are illustrated with two real life medical examples. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Number of times cited according to CrossRef: 38

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