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Mixture General Diagnostic Model

Von Davier, Matthias; Yamamoto, Kentaro; Xu, Xueli
Patent Issued:
Jan 28, 2014
Patent Number:
ETS Patent
Document Type:
Family ID:
Subject/Key Words:
Patent, Active Patent, Computer-Based Testing (CBT), General Diagnostic Model (GDM), Multidimensional Item Response Theory (MIRT), Skill Profile, Test Takers, Item Design, Population Subgroups


Disclosed herein is a method of analyzing examinee item response data comprising constructing a diagnosis model for reporting skill profiles of examinees, wherein the diagnosis model comprises at least a variable representing unobserved subpopulations, creating an item design matrix, distributing examinees across the unobserved subpopulations, iteratively estimating values for a plurality of variables within the diagnosis model, and reporting the estimated values to a user.

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