Modified Achievement Tests for Students with Disabilities: Basic Psychometrics and Group Analyses Ryan J. Kettler Vanderbilt University CCSSO’s National Conference on Student Assessment June 2008
Modified Achievement Tests for Students with Disabilities: Basic Psychometrics and Group Analyses Ryan J. Kettler Vanderbilt University CCSSO’s National.
Dec 15, 2015
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Modified Achievement Testsfor Students with Disabilities:Basic Psychometrics and Group Analyses
Ryan J. KettlerVanderbilt University
CCSSO’s National Conference on Student AssessmentJune 2008
Reliability and Concurrent Validity with a Proficiency Tests
CAAVES Item Mod Data 2008 2
Concurrent Validity with Participation Criteria
CAAVES Item Mod Data 2008 3
CAAVES Item Mod Data 2008 4
Reading: Descriptive Statisticsfor Unmodified and Modified Tests
Distributions by Group and Condition in Reading
CAAVES Item Mod Data 2008 5
Students without Disabilities, Ineligible
Students with Disabilities, Ineligible
Students with Disabilities, Eligible
Effect Sizes of Modifications on Reading Performance
CAAVES Item Mod Data 2008 6
Group Improvement by Condition in Reading
CAAVES Item Mod Data 2008 7
Mean Item Difficulty by Group and Condition in Reading
CAAVES Item Mod Data 2008 8
* Student abilities were equated using a Rasch model.
CAAVES Item Mod Data 2008 9
Math: Descriptive Statistics forUnmodified and Modified Tests
Distributions by Group and Condition in Math
CAAVES Item Mod Data 2008 10
Students without Disabilities, Ineligible
Students with Disabilities, Ineligible
Students with Disabilities, Eligible
Effect Sizes of Modifications on Math Performance
CAAVES Item Mod Data 2008 11
Group Improvement by Condition in Math
CAAVES Item Mod Data 2008 12
Mean Item Difficulty by Group and Condition in Math
CAAVES Item Mod Data 2008 13
* Student abilities were equated using a Rasch model.
Upcoming Analyses: Difficulty Change on Individual Items
CAAVES Item Mod Data 2008 14
Students without Disabilities, Ineligible
Students with Disabilities, Eligible
Conclusions
Assessments can be made more accessible for eligible students (with disabilities who have persistent academic difficulties).
Modifications can change the difficulty of tests and items without invalidating the resulting scores.
Much more work needs to be done!CAAVES Item Mod Data 2008 15
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