|Title:||Partially Nested Randomized Controlled Trials in Education Research: A Guide to Design and Analysis|
In some tests of educational interventions, individual students are randomized directly to the treatment or control group, and both intervention and control protocols are administered in an individual setting. Such an experiment is an Individual-Level Randomized Controlled Trial (I-RCT). In other tests, clusters of students (e.g., classrooms) are randomized. This sort of experiment is called a Cluster Randomized Controlled Trial (C-RCT). However, in some designs, students in the treatment group are clustered like those in a C-RCT, but students in the control group are unclustered, like students in an I-RCT. This design is called a Partially Nested Randomized Controlled Trial (PN-RCT). It is partially nested because students in the treatment group are nested in some higher level unit, such as a tutoring group or class, but students in the control group are not nested as part of the experimental design.
This paper, commissioned by the National Center for Education Research, provides readers with an introduction to PN-RCTs and ways to design and analyze the results from them. This paper was written primarily for applied education researchers with introductory knowledge of quantitative impact evaluation methods. However, those with more advanced knowledge will also benefit from some of the technical examples and appendices.
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|Cover Date:||July 2014|
|Web Release:||July 31, 2014|
|Print Release:||July 31, 2014|
|Publication #:||NCER 20142000
General Ordering Information
|Authors:||Sharon Lohr, Westat; Peter Z. Schochet, Mathematica Policy Research; Elizabeth Sanders, University of Washington; Meredith Larson (Project Officer) and Phill Gagne, NCER.|
|Type of Product:||Research Report|
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