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ERIC Number: EJ859089
Record Type: Journal
Publication Date: 2008
Pages: 15
Abstractor: As Provided
Reference Count: 29
ISBN: N/A
ISSN: ISSN-1934-6875
The Big Picture in Bilingual Education: A Meta-Analysis Corrected for Gersten's Coding Error
Rolstad, Kellie; Mahoney, Kate; Glass, Gene V.
Journal of Educational Research & Policy Studies, v8 n2 p1-15 Fall 2008
In light of a recent revelation that Gersten (1985) included erroneous information on one of two programs for English Language Learners (ELLs), the authors re-calculate results of their earlier meta-analysis of program effectiveness studies for ELLs in which Gersten's studies had behaved as outliers (Rolstad, Mahoney & Glass, 2005). The correction resulted in a change in mean effect size from 0.08 to 0.19 for all outcome measures, from -0.06 to 0.14 for (English) reading, from 0.08 to 0.17 for (English) math, and from -0.01 to 0.10 for all Transitional Bilingual Education (TBE) studies. The revelation of Gersten's coding error, and the inconsistency of Gersten's studies with other studies reviewed, increases confidence in the conclusion that an "investigator effect" suppresses results favoring TBE in these studies. Removing Gersten's studies from the meta-analysis renders an effect size of 0.17 for TBE, nearly as high as for Developmental Bilingual Education (DBE). The authors argue that the most informative result is the effect size reported for studies involving ELLs in both treatment and control groups, with an average effect size for TBE of 0.23. The new analysis therefore strengthens the conclusions previously reached in the authors' original research supporting TBE over English-only approaches, and DBE over TBE. (Contains 1 table and 2 endnotes.)
National Office for Research on Measurement and Evaluation Systems. University of Arkansas, 346 North West Avenue, 302 WAAX, Fayetteville, AR 72701. Tel: 479-575-5593; Fax: 479-575-5185; e-mail: normes@uark.edu; Web site: http://normes.uark.edu/erps/resources.html
Publication Type: Journal Articles; Reports - Evaluative
Education Level: Adult Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A