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The '''average treatment effect''' ('''ATE''') is a measure used to compare treatments (or interventions) in randomized experiments, evaluation of policy interventions, and medical trials. The ATE measures the difference in [[mean]] (average) outcomes between units assigned to the treatment and units assigned to the control.  In a [[randomized trial]] (i.e., an experimental study), the average treatment effect can be [[Estimator|estimated]] from a sample using a comparison in mean outcomes for treated and untreated units. However, the ATE is generally understood as a [[causal]] parameter (i.e., an estimate or property of a [[Statistical population|population]]) that a researcher desires to know, defined without reference to the [[study design]] or estimation procedure. Both [[Observational study|observational]] studies and experimental study designs with random assignment may enable one to estimate an ATE in a variety of ways.

The '''average treatment effect''' ('''ATE''') is a measure used to compare treatments (or interventions) in randomized experiments, evaluation of policy interventions, and medical trials. The ATE measures the difference in [[mean]] (average) outcomes between units assigned to the treatment and units assigned to the control.  In a [[randomized trial]] (i.e., an experimental study), the average treatment effect can be [[Estimator|estimated]] from a sample using a comparison in mean outcomes for treated and untreated units. However, the ATE is generally understood as a [[causal]] parameter (i.e., an estimate or property of a [[Statistical population|population]]) that a researcher desires to know, defined without reference to the [[study design]] or estimation procedure. Both [[Observational study|observational]] studies and experimental study designs with random assignment may enable one to estimate an ATE in a variety of ways.

平均治疗效果(Average Treatment Effect, ATE)是在随机试验、政策干预评估和医学试验中用于比较治疗或干预的一种测量方法。平均治疗效果测量分配给治疗的单位和分配给控制的单位之间的<font color="#ff8000">平均 Mean</font>结果的差异。在随机试验或者实验研究中，平均治疗效果可以通过比较样本在治疗单元和未治疗单元的平均结果进行估计获得。然而，ATE 通常被理解为研究人员希望知道的一个因果参数(即一个总体的估计或属性) ，定义时不参考研究设计或估计过程。随机分配的观察性研究和实验性研究设计可能使人们以多种方式估计平均治疗效果。

平均处理效应(Average Treatment Effect, ATE)是在随机实验、政策干预评估和医学实验中用于比较治疗或干预的一种测量方法。平均处理效应测量分配给处理单位和控制单位之间的<font color="#ff8000">平均 Mean</font>结果的差异。在随机实验或者实验研究中，平均处理效应可以通过比较样本在处理单元和未处理单元的平均结果进行估计获得。然而，ATE 通常被理解为研究人员希望知道的一个因果参数(即一个总体的估计或属性) ，定义时不参考试验设计或估计过程。观察性研究和随机赋值的实验性研究设计可能使以多种方式估计平均处理效应。

== General definition ==

== General definition ==