Cohen G R, Yang S Y
Department of Public Health Sciences, University of Edinburgh, Medical School, Scotland, U.K.
Stat Med. 1994 Nov 15;13(21):2189-203. doi: 10.1002/sim.4780132102.
Conventionally a confidence interval (CI) for the standardized mortality ratio is set using the conservative CI for a Poisson expectation, mu. Employing the mid-P argument we present alternative CIs that are shorter than the conventional ones. The mid-P intervals do not guarantee the nominal confidence level, but the true coverage probability is only lower than the nominal level for a few short ranges of mu. The implications for mid-P confidence intervals of various proposed definitions of two-sided tests for discrete data are discussed.
传统上，标准化死亡率比的置信区间（CI）是使用泊松期望μ的保守置信区间来设定的。采用中P论证，我们提出了比传统置信区间更短的替代置信区间。中P区间不能保证名义置信水平，但对于μ的几个短区间，实际覆盖概率仅略低于名义水平。本文讨论了离散数据双侧检验各种提议定义对中P置信区间的影响。
