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CPT Help Home -> Specific Menu Items -> Options -> Forecast Settings Verification SettingsThe verification settings option also allows you to specify how many probability bins are used to construct the attributes and ROC diagrams, as well as some of the scores, as discussed below. The default number is 11, as recommended by the WMO Standardized Verification System for Long-Range Forecasts (SVSLRF), which means that each bin is 10% wide (except for the first (0-5%) and last (95-100%) bin), and is suitable for GCM outputs, for example. However, there is an option to use 21 bins, which means that each bin is 5% wide (except for the first (0.0-2.5%) and last (97.5-100.0%) bin). Since the Regional Climate Outlook Forums tend to issue probabilities rounded to the nearest 5% rather than 10%, using 21 bins permit the attributes diagrams to be constructed with a point for each discrete probability (except for 33%, which is binned with 35%).There is also an option to use the binned probabilities when calculating some of the Verification Scores. The default is to bin the probabilities only for those scores that require binning, namely:
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