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Exact sample size determination for the ratio of two incidence rates under the Poisson distribution

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  • Guogen Shan

    (University of Nevada Las Vegas)

Abstract

We present sample size determination using exact approaches for testing the ratio of incidence rates from a two-arm non-inferiority trial. The first approach is the exact conditional approach by treating the total number of events from two groups fixed, and the other is the exact unconditional approach based on maximization. Exact approaches guarantee the type I error rate which is often not satisfied in the commonly used asymptotic approaches on the basis of the corresponding limiting distributions of test statistics. We provide tables for sample size determination in commonly used cases in practice, and an example is used to show the application of these exact approaches. Sample size comparison using different exact approaches concludes that the exact unconditional approach based on the Wald-type test statistic has good performance in balanced studies.

Suggested Citation

  • Guogen Shan, 2016. "Exact sample size determination for the ratio of two incidence rates under the Poisson distribution," Computational Statistics, Springer, vol. 31(4), pages 1633-1644, December.
    • Handle: RePEc:spr:compst:v:31:y:2016:i:4:d:10.1007_s00180-016-0654-6
    DOI: 10.1007/s00180-016-0654-6
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    References listed on IDEAS

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    1. Hui-Qiong Li & Man-Lai Tang & Weng-Kee Wong, 2014. "Confidence intervals for ratio of two Poisson rates using the method of variance estimates recovery," Computational Statistics, Springer, vol. 29(3), pages 869-889, June.
    2. Liu, MingTe & Hsueh, Huey-Miin, 2013. "Exact tests of the superiority under the Poisson distribution," Statistics & Probability Letters, Elsevier, vol. 83(5), pages 1339-1345.
    3. repec:bla:biomet:v:71:y:2015:i:4:p:985-995 is not listed on IDEAS
    4. Chiu, Sung Nok & Wang, Ling, 2009. "Homogeneity tests for several Poisson populations," Computational Statistics & Data Analysis, Elsevier, vol. 53(12), pages 4266-4278, October.
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