Herbal combinations are important for traditional Chinese medicine physicians to treat diseases. Based on Professor GAO Zhongying’s medical records, combination laws are explored in order to study and inherit Professor GAO’s academic thoughts and improve the level of clinical treatment from multiple perspectives in treating chronic gastritis. Based on an entropy clustering method of complex systems, Professor GAO’s formula data is mined to draw the combinations which have good effects on the treatment of chronic gastritis. Meanwhile, the software Pajek developed for complex network was applied in the process. It not only provides a group of fast and efficient algorithms to analyze complex networks, but also presents a visual interface to facilitate the understanding on the structural characteristics of complex networks from a visual point of view. Through analyzing the commonness of Professor GAO’s formulas, we found the compatibility structure that reflected formula thinking and core clinical features, and supported the arrangement of Professor GAO’s experiences. Through the procedure mentioned mentioned, we analyzed and screened 730 formulas in the database, and found 30 herbs most frequently used in the treatment of chronic gastritis. By applying the measure of modified mutual information, we got 94 commonly-used herbs with correlation coefficients above 0.05; and through the entropy clustering method of complex systems, we found 11 core combinations. The entropy clustering method of complex systems was used to build the association among 80 herbs commonly used to treat chronic gastritis, and then 122 associations were obtained. We draw out the complex network graph of herbs commonly used for chronic gastritis. These results are completely in line with clinical practices, and they are essentially the commonly used herbs employed by Professor GAO Zhongying for chronic gastritis.
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