Date of Award
1-1-2012
Document Type
Dissertation
Degree Name
Ph.D.
Organizational Unit
Morgridge College of Education
First Advisor
Kathy E. Green, Ph.D.
Second Advisor
Karen Riley
Third Advisor
Monica Martinussen
Fourth Advisor
Nicholas Cutforth
Fifth Advisor
Antonio Olmos-Gallo
Sixth Advisor
Donald Bacon
Keywords
Accommodations, Differential boost, High-stakes test, Meta-analysis, Meta-regression, Students with disabilities
Abstract
Test accommodations are designed to ensure the comparability of test scores between students and their typically developing counterparts by eliminating as much construct-irrelevant variance and construct-irrelevant difficulty as possible. Although those involved in test creation endeavor to create tests with suitable accommodations for students with disabilities, there is lack of consensus regarding accommodation efficacy. Using meta-analysis and meta-regression to summarize previous research, this study examined whether test accommodations differentially boost test scores of students with disabilities, and whether accommodated conditions provided a more effective and valid assessment of students with disabilities. Results from the meta-analysis of 34 studies (119 effect sizes) lend support to the differential boost hypotheses, whereby students with disabilities (mean effect size = 0.30, k = 62, p < 0.001) are positively impacted by test accommodations while their typically developing peers (mean effect size = 0.17, k = 57, p < 0.001) gain little from test accommodations.
Presentation assessment accommodations (mean effect size = 0.22, k = 41, p < 0.001) had a small statistically significant impact on the performance of students with disabilities, while use of timing/scheduling accommodations (mean effect size = 0.47, k = 17, p < 0.001) had a small, bordering on medium, statistically significant impact on these students. The effect for presentation accommodations intensified when narrowing the focus to students with learning disabilities (mean effect size = 0.36, k = 23, p < 0.001) but not for timing/scheduling accommodations (mean effect size = 0.48, k = 13, p < 0.001). Overall results for setting (k = 1) and response (k = 3) accommodations were not available as there were too few studies for an overall comparison.
The results of meta-regression analyses examining the effects of assessment accommodations on test scores for students with disabilities showed that 42% of the heterogeneity in test score could be explained by an overall model examining population description, test characteristic, results dissemination, and researcher-manipulated (test accommodation effect size for students with disabilities) variables. Population description and test characteristic variable sets explained the greatest amounts of variability for mean increase in test score, R2=0.22 and R2 =0.35 respectively; researcher-manipulated variable (test accommodation) and research dissemination explained little variance, R2 =0.07 and R2 =0.01, respectively.
Publication Statement
Copyright is held by the author. User is responsible for all copyright compliance.
Rights Holder
Michelle Vanchu-Orosco
Provenance
Received from ProQuest
File Format
application/pdf
Language
en
File Size
375 p.
Recommended Citation
Vanchu-Orosco, Michelle, "A Meta-Analysis of Testing Accommodations for Students with Disabilities: Implications for High-Stakes Testing" (2012). Electronic Theses and Dissertations. 668.
https://digitalcommons.du.edu/etd/668
Copyright date
2012
Discipline
Educational tests & measurements, Special education
Included in
Disability and Equity in Education Commons, Educational Assessment, Evaluation, and Research Commons