waiter or attendant in an inn or tavern; a term used in former times or in traditional literature.

a mathematical method used in statistics to find the best-fitting curve for a set of data by minimizing the sum of the squares of the vertical deviations

statistical method used in data analysis to find the best-fitting curve or line by minimizing the sum of the squares of the vertical deviations

(traditional) a young waiter in a shop, restaurant, or inn; also written as [[店小二|店小二|dian4 xiao3 er4]]