This utility can be used to compare the performance of two tests evaluated in the same population. Kappa and proportions of positive and negative agreement are calculated, as well as McNemar's Chi-squared value. Corresponding p-values are also calculated for both kappa and Chi-squared values. For infected populations, sensitivity values are calculated for both tests, as well as sensitivity covariances. Similarly, if the population is specified as uninfected, specificity values and specificity covariances are calculated, including Wilson binomial confidence limits for Se and sp estimates.