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Vertical Scaling: Hands-on Practice and Evaluation of IRT Linear and Non-linear Methods

Thu, April 11, 1:00 to 5:00pm, Convention Center, Floor: First, 125

Session Type: Training Session

Abstract

This training demonstrates the empirical application of vertical scaling approaches developed for newly launched large-scale assessments. Vertical scales are a current interest in K-12 testing programs for supporting the measuring and tracking of growth across grade levels. This training session focuses on the following topics: (1) conceptual and technical background of vertical scaling, including the definition of student growth, data collection design, and scaling methods, (2) step-by-step guides to conduct item response theory (IRT) vertical scaling with linear and non-linear methods of converting student ability estimates to scaled scores, (3) a hands-on exercise related to evaluating scaling outcomes and comparing scaled scores, and (4) practical issues and future research topics on vertical scaling. Through the training session, we hope participants will achieve empirical vertical scaling work experience and an understanding of the challenges and limitations related to vertical scaling that psychometricians face in new test development. The training is targeted toward advanced graduate students or new measurement professionals who want to practice vertical scaling. We recommend that participants have some background knowledge in IRT-based equating and scaling, but it is not required. Attendees should bring their own laptops to conduct the hands-on activities.

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