Professor LI Zinai is on the editorial board of “A Dictionary of Modern Economics”, and he also serves as the editor of the volume “Econometrics”. Econometrics is an important and fundamental field of modern economics, forming the basis of many substantive economic fields. The “Econometrics” volume in the “Dictionary” introduces the history, basic theory, and applications of econometrics. Professor LI contributed several essential entries, such as “Econometrics”, to this dictionary.