data published originally in: Stover L, Gorga MP, and Neely T. Torwards optimizing the clinical utility of distortion product otoacoustic emission measurements. Journal of the Acoustical Society of America 100:956-967. 1996.
see: Pepe M. Regression Analysis of ROC curves. Biometrics 54:124-135. 1998.
gold standard assessment of hearing status based on behaviorally determined hearing thresholds (i.e. amt in this dataset?)
the second of 2 intensities (l1,l2) corresponding to simultaneous stimulus sounds, where l1 - l2 is fixed at 10 dB
the higher of 2 frequencies (f1,f2) corresponding to simultaneous stimulus sounds, where f2/f1 is fixed at 1.2