The random effects estimate and its confidence interval address the question 'what is the average treatment effect?
随机效应估计和它的可信区间会提出这样一个问题，“平均效应是什么？”
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。
A structural regression model for causal inference is established to estimate the average treatment effect under strongly ignorable treatment assignment.
建立强可忽略处理分配条件下因果推断的结构回归模型，估计平均处理效应。
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