Fig. 3

Relationships between classification performance metrics and LP segment window length in the test data from the ALLSTAR database. The LP images were annotated with the strict criteria. Panels a and b show sensitivity, specificity, positive and negative predictive values (PPV and NPV), accuracy, and area under the curve (AUC). Panels c and d show positive and negative likely hood ratios, respectively. The x-axis in b–d is the common log values of segment window length in beat. Dotted lines represent regression lines with parabolic functions