Fig. 1From: Predicting anatomic therapeutic chemical classification codes using tiered learningThe empirical distribution of ATC codes at the top level (Pie chart) and at the second level for each of the fourteen anatomical groups in a dataset of 2232 compounds from the ChEMBL used in this study. The pie chart presents the distribution of ATC codes at the anatomical group-level. The bar charts present the distribution of compounds within each of the anatomical groups. It is apparent that each anatomical group has a characteristic distribution, which becomes increasingly specific as one traverses the ATC hierarchyBack to article page