Confidence limits for the ratio of two rates based on likelihood scores: non-iterative method

Stat Med. 2003 Jun 30;22(12):2071-83. doi: 10.1002/sim.1405.


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.

MeSH terms

  • Breast Neoplasms / etiology
  • Confidence Intervals*
  • Data Interpretation, Statistical*
  • Female
  • Fluoroscopy / adverse effects
  • Humans
  • Likelihood Functions*
  • Poisson Distribution*
  • Tuberculosis / diagnosis