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Binomial Distribution Sample Confidence Interval Estimation for Positiveand Negative Likelihood Ratio Medical Key Parameters

机译:正二项分布样本置信区间估计和负似然比医学关键参数

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摘要

Likelihood Ratio medical key parameters calculated on categorical results from diagnostic tests are usually express accompanied with their confidence intervals, computed using the normal distribution approximation of binomial distribution. The approximation creates known anomalies, especially for limit cases. In order to improve the quality of estimation, four new methods (called here RPAC, RPAC0, RPAC1, and RPAC2) were developed and compared with the classical method (called here RPWald), using an exact probability calculation algorithm.Computer implementations of the methods use the PHP language. We defined and implemented the functions of the four new methods and the five criterions of confidence interval assessment. The experiments run for samples sizes which vary in 14 – 34 range, 90 – 100 range (0 < X < m, 0 < Y < n), as well as for random numbers for samples sizes (4 ≤ m, n ≤ 1000) and binomial variables (1 ≤ X, Y < m, n).The experiment run shows that the new proposed RPAC2 method obtains the best overall performance of computing confidence interval for positive and negative likelihood ratios.
机译:通常将根据诊断测试的分类结果计算出的似然比医学关键参数及其置信区间表示出来,并使用二项式分布的正态分布近似值进行计算。这种近似会产生已知的异常,特别是对于极限情况。为了提高估计的质量,开发了四种新方法(此处称为RPAC,RPAC0,RPAC1和RPAC2),并使用精确概率计算算法将其与经典方法(此处称为RPWald)进行了比较。使用PHP语言。我们定义并实现了四种新方法的功能和置信区间评估的五项标准。实验针对的样本大小在14 – 34范围,90 – 100范围(0

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