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. 2013 May 31;8(5):e65587. doi: 10.1371/journal.pone.0065587

Figure 2. Synthesis of several decision trees generated during the ML training.

Figure 2

The aa at the top of each box is relative to the attributes specified at the first and second level of the trees. A, B, C and D indicate the low, moderate, high and very high bins, respectively (for more details, see Table 3 and the “Materials and Methods” section). Green boxes, a combination that classifies an instance as a PPI; Red boxes, a combination that classifies an instance as a no-PPI; Brown boxes, a combination that classifies an instance as a PPI or no-PPI; “?”, a combination for which an instance can not be classified, requiring classification at the next level of the tree.