Xu Lili: Female, born in Nanchang, Jiangxi, assistant professor of Beijing Normal University in Zhuhai. She graduated from the School of Mathematical Sciences of Beijing Normal University in 2007, majoring in statistics, and studied at the School of Mathematics and Statistics of Texas Tech University in the United States from October to October, 2007. In 2008, under the recommendation of my tutor, I participated in the sub-prime mortgage crisis model analysis project jointly researched by the Statistics Department of Texas Tech University and Federal Reserve analysts, undertook the data analysis and model construction, and jointly wrote the paper "Sub-prime mortgage crisis: rational exception or rational mistake". 20 10 obtained a master's degree in statistics from Texas Tech University. In the same year, he represented the school at the conference on clinical trial statistics held at Pennsylvania State University. During my master's degree, I served as an assistant lecturer, teaching basic mathematics courses for non-mathematics majors, including mathematical statistics, business statistics, mathematical analysis, university algebra and so on. 20 1 1 Returned to China as the head of the risk control department of An Deyu Microfinance Co., Ltd. in Qingshanhu District. In the autumn of 20 12, I worked in the College of Applied Mathematics of Beijing Normal University.