Analysis and Disposal of Pathogenic Factors of Exogenous Affections Based on the ID3 Decision Tree Method

In order to find out the critical factors on exogenous pathogeny, we classified 2590 disease cases based on the ID3 decision tree method. Our classification result is acquired by calculating the information entropy, conditional entropy and information gain, according to "the six pathogenic factors". In the process, we first gained a set of basic factors of exogenous affection by filtering and pre-process methods. And then we established a decision tree with critical factors. Finally, we transformed the decision tree into production rules to support the diagnostic system.