A SIMPLE SOLUTION TO THE IDENTIFICATION PROBLEM IN DETAILED WAGE DECOMPOSITIONS
针对Oaxaca和Ransom指出的详细工资分解中系数效应因虚拟变量参照组选择而不唯一的问题，提出使用标准化回归来识别常数项和每个虚拟变量的估计值，从而提供简单自然的解决方案。
Oaxaca and Ransom (1999) show that a detailed decomposition of the coefficients effect is destined to suffer from an identification problem since the detailed coefficients effect attributed to dummy variables is not invariant to the choice of reference groups. It turns out that the identification problem in the decomposition equation is a disguised identification problem of constant and dummy variables in a regression equation. This article proposes a simple and natural remedy for this problem by using “normalized” regressions, which enable me to identify the constant and estimates of each dummy variable.