Estimating the Standard Error of the Impact Estimator in Individually Randomized Trials With Clustering

Estimating the Standard Error of the Impact Estimator in Individually Randomized Trials With Clustering
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通过聚类估计单独随机试验中影响估计器的标准误差

DOI:
10.1080/19345747.2015.1086911
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发表时间:
2014
影响因子:
1.8
通讯作者:
D. McCaffrey
D. McCaffrey
中科院分区:
教育学3区
文献类型:
--
作者:
Michael J. Weiss;J. R. Lockwood;D. McCaffrey

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摘要 在“单独随机分组治疗”(IRGT)实验设计中,个体首先被随机分配到治疗组或对照组,然后在每个组内被分组在一起(例如,在教室/学校内,通过共享病例经理,在小组治疗课程中,通过共享医生等)接受服务。在第二阶段分组不受实验控制的常见情况下,我们证明随机效应模型和固定效应模型估计治疗效果的标准误差估计量是有偏差的,因为计算标准误差所需的参数无法从数据中识别。我们讨论了设计和分析 IRGT 的影响,并提供了减轻偏差的建议。
ABSTRACT In the “individually randomized group treatment” (IRGT) experimental design, individuals are first randomly assigned to a treatment arm or a control arm, but then within each arm, are grouped together (e.g., within classrooms/schools, through shared case managers, in group therapy sessions, through shared doctors, etc.) to receive services. In the common setting where the second-stage grouping is not experimentally controlled, we demonstrate that the standard error estimators for the estimated treatment effects from both random and fixed effects models are biased because parameters required to compute the standard errors are not identifiable from the data. We discuss implications for designing and analyzing IRGTs and provide suggestions for mitigating the bias.
治疗师效应对心理治疗比较研究的设计和分析的影响。
DOI: 10.1037//0022-006x.59.1.20
发表时间: 1991
影响因子: 5.9
作者:
Crits-Christoph,P;Mintz,J
通讯作者: Mintz,J