由于每个国家只有一个观测结果,因此不可能控制各国间未观察到的异质性。
With only one observation per country, it is impossible to control for unobserved heterogeneity across countries.
而Mantel-Haenszel法却会提供一个更加稳健的平均效应估计,但是这种方法要以忽视被观察到的异质性的存在为代价。
The Mantel-Haenszel method will provide more robust estimates of the average treatment effect, but at the cost of ignoring the observed heterogeneity.
而Mantel-Haenszel法却会提供一个更加稳健的平均效应估计,但是这种方法要以忽视被观察到的异质性的存在为代价。
The Mantel-Haenszel method will provide more robust estimates of the average treatment effect, but at the cost of ignoring the observed heterogeneity.
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