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ERIC Number: ED530371
Record Type: Non-Journal
Publication Date: 2012
Pages: 9
Abstractor: ERIC
Reference Count: 15
Weighting Methods for Assessing Policy Effects Mediated by Peer Change
Hong, Guanglei; Nomi, Takako
Society for Research on Educational Effectiveness
This study introduces a new set of weighting procedures for revealing the mediation mechanism in multi-level settings. These methods are illustrated through an investigation of whether the impact of a system-wide policy change on student outcomes is mediated by policy-induced peer composition change. When the policy changed not only lower-achieving students' course-taking but also the ability composition of math classes among other concurrent changes, unpacking the overall policy impact on math achievement is challenging. To illustrate, the causal questions focus on decomposing the total policy effect into the indirect effect mediated by peer composition change and the direct effect of the policy for the subpopulation of lower achieving students. Specifically, the authors ask: (1) Did the increase in peer ability mediate the policy effect on these students' math achievement? (2) Would the policy have a direct effect on these students' math achievement if their peer composition had remained unchanged by the policy? (Contains 1 table and 1 figure.)
Society for Research on Educational Effectiveness. 2040 Sheridan Road, Evanston, IL 60208. Tel: 202-495-0920; Fax: 202-640-4401; e-mail:; Web site:
Publication Type: Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: Society for Research on Educational Effectiveness (SREE)
Identifiers - Location: Illinois
Identifiers - Assessments and Surveys: Iowa Tests of Basic Skills
IES Funded: Yes
Grant or Contract Numbers: R305D100033