Confidence limits for the ratio of two rates based on likelihood scores

Non-iterative method

P. L. Graham, K. Mengersen, A. P. Morton

Research output: Contribution to journalArticle

39 Citations (Scopus)


This paper describes a method for creating a confidence interval for the ratio of rates using the score statistic. This non-iterative and easy to apply procedure produces confidence intervals that are suitable for use with Poisson data and simulation results indicate that it is close to the nominal level for a wide range of scenarios.

Original languageEnglish
Pages (from-to)2071-2083
Number of pages13
JournalStatistics in Medicine
Issue number12
Publication statusPublished - 30 Jun 2003
Externally publishedYes

Bibliographical note

A correction for this article exists in Statistics in Medicine, vol. 23, issue 22, p. 3549. DOI: 10.1002/sim.2046


  • confidence interval
  • coverage probability
  • poisson rates
  • rate ratio

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