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ERIC Number: ED545747
Record Type: Non-Journal
Publication Date: 2012
Pages: 79
Abstractor: As Provided
Reference Count: N/A
ISBN: 978-1-2675-0893-5
Measuring Response to Intervention: Comparing Three Effect Size Calculation Techniques for Single-Case Design Analysis
Ross, Sarah Gwen
ProQuest LLC, Ph.D. Dissertation, North Carolina State University
Response to intervention (RTI) is increasingly being used in educational settings to make high-stakes, special education decisions. Because of this, the accurate use and analysis of single-case designs to monitor intervention effectiveness has become important to the RTI process. Effect size methods for single-case designs provide a useful way to analyze single-case data; however, little research exists that compares the various types of effect size methods. This study compared three competing single-case effect size methods: (a) the regression-based, Allison-MT method (Allison & Gorman, 1993); (b) the new, non-overlap-based, Tau-U method (Parker, Vannest, Davis, & Sauber, 2011); and (c) the standardized mean difference-based, Busk-Serlin-Model 2 (Busk & Serlin, 1992). Using previously published AB datasets that measure the Words read Correct per Minute (WCPM) variable, these three methods were compared using a repeated-measures ANOVA to determine if overall differences existed between obtained effect size scores when analyzing the same data. Additionally, the range of effect size scores obtained from each method and the effect of removing lag-1 autocorrelation from the original data were examined. Results indicated that the Tau-U method was least affected by autocorrelation, however, there was no significant difference between scores obtained by the Allison-MT and Tau-U methods after the removal of autocorrelation. With autocorrelation removed, effect size scores appear to fit within interpretation guidelines for group designs. Implications of these findings for research and practice are discussed. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page:]
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Publication Type: Dissertations/Theses - Doctoral Dissertations
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A