各位大侠,在易丹辉书第七章联立方程识别里面提到了工具变量,但好像没有给解释,只是说工具变量一定是先决变量。
请高手指点,究竟什么是工具变量,其定义如何?
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楼主: zhyuyue2008
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[问答] 工具变量是什么 |
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学前班 70%
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回帖推荐In statistics and econometrics, an instrumental variable (IV, or instrument) can be used to produce a consistent estimator of a parameter when the explanatory variables (covariates) are correlated with the error terms. Such correlation can be caused by endogeneity, by omitted covariates, or by measurement errors in the covariates. In this situation, ordinary linear regression produces biased and i ...
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