These three test textbooks mainly focus on data analysis methods and models, and take products, customers, marketing, supply chain and investment as the main application scenarios. They not only have the whole data analysis process of the complete scene, but also the analysis algorithm and examples of each module. Integrate theory with practice, highlighting methods and practical operations. It is a rare series of professional reference books specializing in data analysis affairs and enterprise data analysis, and it is also a reference book for people engaged in data analysis teaching, business promotion and data conversion in various industries.