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Decision trees showing three examples of classification algorithms for years with decreasing, stable, and increasing WND incidence. The parameters and their threshold values are indicated on the branches. Correct classification in terminal nodes is underlined. (a) ExpMod 1A* for Astrakhan Province. (b) ProMod 1V for Volgograd Province. (c) ExpMod 1AVR* for three provinces of Southern Russia together.
