A Computer Program for Rapid Generation of Receiver Operating Characteristic Curves and Likelihood Ratios in the Evaluation of Diagnostic Tests

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Abstract
We describe a MUMPS program to facilitate the evaluation of the diagnostic effectiveness and efficiency of laboratory tests using receiver operating characteristic (ROC) curves and likelihood ratios (LR). Test results from a population with and without a disease are stored into retrievable, editable data bases. Either single or a combination (≤9) of different test data files can be accessed to generate tables of calculated frequency distribution, sensitivity, 1-specificity and LR at variable decision thresholds. The program also calculates the area under the ROC curve, confidence intervals and SE. The selection of the optimum cut-off value is assisted by graphical plots of frequency distribution, ROC and decision level curves as illustrated by using some ‘cardiac’ enzyme tests.

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