RMS binaural intelligibility prediction error (a) and Pearson correlation coefficient (b) for the better-ear monaural HASPI v2 with the neural networks fitted to the monaural intelligibility scores (v2 Better Ear), the better-ear monaural HASPI v2 with the neural networks fitted to the binaural intelligibility scores (Bin Fit Better Ear), and the binaural interaction model fitted to the binaural intelligibility scores (Binaural Sum). The model accuracy is indicated for the combined NH plus HI subjects; each point represents data averaged over processing conditions, subjects, and repetitions.