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Abstract Title: A metric for measuring the constancy of item response curves
Abstract: For common assessments, such as the Force Concept Inventory (FCI), we can construct item response curves (IRCs) to test how well items of the concept inventory are functioning in terms of whether certain answer choices are effectively serving as distractors.  This was done in prior work to construct transition matrices for the FCI where instructors can observe the transitions the students are making as a result of instruction--even when they select a wrong answer on both the pre-test and post-test. One question that came from that work was whether how the answer choices were ranked would depend on the population, i.e., whether the IRCs remained constant for different populations. This work outlines a method that allows for effectively comparing the IRCs between two populations. We apply the method to a set of 12,803 responses to the 25-item Science Literacy Concept Inventory (SLCI).
Abstract Type: Contributed Poster Presentation
Session Time: Poster Session II
Poster Number: B90

Author/Organizer Information

Primary Contact: Paul J. Walter
St. Edward's University
School of Natural Sciences
3001 S. Congress Ave.
Austin, TX 78704
Phone: 512-364-3158