Comparison between the computed true skill statistics (TSS) for different classifiers using different segmentation techniques and sets of attributes. On each box, the central mark is the median (50th percentile), the edges of the box are the 25th and 75th percentiles, the whiskers show the ±2.7σ range covering 99.3% of the data and outliers are plotted individually as red crosses. (a) Intensity Threshold (all attributes), (b) SPoCA (all attributes), (c) SPoCA (only attributes from AIA).