Violating ignorability of treatment by controlling for too many factors

被引：62

作者：

Wooldridge, JM ^{[1
]}

机构：

[1] Michigan State Univ, Dept Econ, E Lansing, MI 48824 USA

来源：

ECONOMETRIC THEORY | 2005年 / 21卷 / 05期

关键词：

D O I：

10.1017/S0266466605050516

中图分类号：

F [经济];

学科分类号：

02 ;

摘要：

This problem shows how the key ignorability-of-treatment assumption used in estimating treatment effects can be violated when certain factors are included among the covariates. The case considered is when there are J + 1 treatment levels, treatment is randomized with respect to potential outcomes, but the distribution of included covariates differs across treatment levels.

引用

页码：1026 / 1028

页数：3