Non-iterative method demonstrates reliable confidence intervals for rate ratios in Poisson data.
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.
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Graham et al. (2003) studied this question.
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