On the single test output screen is a button to perform bootstrap resampling . On the bootstrap screen , the user selects the number of bootstrap iterations and type of sampling required . AccuROC allows plotting and printing of ROC curves and Copying and Pasting of curves into other Windows documents . AccuROC allows exporting of curves to graphics packages such as Harvard Graphics . It does, however, appear clear that nonparametric methods, such as those based on the Mann-Whitney statistic, do not require a binormal data distribution .
Nonparametric methods make minimal data assumptions .
For example, as the Mann-Whitney statistic is based on ranks , it requires only ordinal, not interval or ratio, level data , a situation consistent with most rating scales , for example. In fact, as the number of cutpoints increases, the nonparametric ROC curve approaches the smoothed binormal curve . AccuROC requires a minimum of five cutpoints . Validation AccuROC uses several methods of validation . As these check for user errors, all unacceptable entries result in an explicit and full error message to the user.