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Figure 3 Receiver operating characteristic (ROC) curves of the combined time domain and spectral turbulence analysis (TD+STA) model, compared with isolated time domain (TD, left panel) or spectral turbulence analysis (STA, right panel) techniques. In each panel the thick solid line represents the curve obtained with the combined TD+STA model. For each isolated technique, the thin solid line represents the curves obtained with its conventional cutoffs, and the dotted line represents the corresponding curve, using its "optimal" cutoffs (shown in Fig. 1). Both lines are quite close, but the optimized curves have a slightly higher specificity up to sensitivity levels of 90%; however, the differences between those ROC curves were not statistically significant. Note that in each panel, the best sensitivity–specificity balance is obtained with the combined TD+STA model, with a significantly greater area than any other ROC curve.
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