This Demonstration compares two receiver operating characteristic (ROC) plots of two diagnostic tests (first test: blue plot, second test: orange plot) measuring the same quantity, for normally and log-normally distributed populations, for various values of the mean and standard deviation of the healthy and diseased populations, and of the uncertainty of measurement of the tests. The ratio of the areas under the ROC curves of the two diagnostic tests is calculated. The six parameters that you can vary using the sliders are measured in arbitrary units. In addition, the pdf of both populations can be assumed to be normal or log-normal using the respective button.
