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

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. Copyright (C) 2003 John Wiley Sons, Ltd.