Classification and aggregation: An application to industrial classification in cps data
提出一种聚合工业分类的方法，用于估计包含行业效应的工资方程，通过权衡拟合优度与简洁性来生成一致的聚合序列。
Abstract In this paper we offer a method for deciding how to aggregate a set of elementary industries. The method is then applied to the problem of estimating a wage equation that allows for industry‐specific effects. Our method explicitly formalizes the trade‐off between goodness‐of‐fit and parsimony implicit in an aggregation problem. By varying the parameter of the assumed loss function, one obtains a whole sequence of aggregation levels. Further, the resulting sequence is consistent; that is, groupings formed at one level of aggregation will never be undone when one aggregates further.