Zhou X H
Department of Medicine, Indiana University School of Medicine, Indianapolis 46202-5200, USA.
Med Decis Making. 1995 Jul-Sep;15(3):276-82. doi: 10.1177/0272989X9501500310.
The receiver operating characteristic (ROC) curve is widely accepted as the measurement that best represents the accuracy of a diagnostic system that consists of a diagnostic imaging modality and a reader who is interpreting results from the modality. However, there is one implicit assumption in a ROC curve: that the cutoff points to declare a positive test for decision variables of a diseased patient and a nondiseased patient are the same. If this assumption is violated, then a ROC curve does not exist. The author develops a statistical procedure to test this assumption. To demonstrate, he applies the method to a ROC data set and shows that the assumption of the equal cutoff points could be rejected.
接收者操作特征（ROC）曲线被广泛认为是最能代表由诊断成像模态和解读该模态结果的阅片者组成的诊断系统准确性的度量方法。然而，ROC曲线存在一个隐含假设：对于患病患者和未患病患者的决策变量，宣布检测为阳性的截断点是相同的。如果这个假设不成立，那么ROC曲线就不存在。作者开发了一种统计程序来检验这个假设。为了进行演示，他将该方法应用于一个ROC数据集，并表明相等截断点的假设可以被拒绝。
