Intraclass correlation values for planning group-randomized trials in education
Intraclass correlation values for planning group-randomized trials in education
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DOI：
10.3102/0162373707299706
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发表时间：
2007-03-01
影响因子：
3.4
通讯作者：
Hedberg, E. C.
中科院分区：
文献类型：
--
作者：
Hedges, Larry V.;Hedberg, E. C.
将完整群体分配给治疗条件的实验在社会研究中越来越常见。在教育研究中，指定的群体通常是学校。分组随机实验的设计需要了解组内相关结构，以计算实现足够功效所需的统计功效和样本量。本文提供了学业成绩的组内相关值和相关协变量效应的汇编，可用于规划教育中的分组随机实验。它还提供了方差分量信息，这对于规划涉及协变量的实验非常有用。说明了如何使用这些值来计算组随机实验的统计功效。
Experiments that assign intact groups to treatment conditions are increasingly common in social research. In educational research, the groups assigned are often schools. The design of group-randomized experiments requires knowledge of the intraclass correlation structure to compute statistical power and sample sizes required to achieve adequate power This article provides a compilation of intraclass correlation values of academic achievement and related covariate effects that could be used for planning group-randomized experiments in education. It also provides variance component information that is useful in planning experiments involving covariates. The use of these values to compute the statistical power of group-randomized experiments is illustrated.