Mixture General Diagnostic Model (Expired)
- Author(s):
- Von Davier, Matthias; Yamamoto, Kentaro; Xu, Xueli
- Patent Issued:
- Jan 28, 2014
- Patent Number:
- 8,639,176
- Source:
- ETS Patent
- Document Type:
- Patent
- Family ID:
- 39144498
- Subject/Key Words:
- Patent, Expired Patent, Computer-Based Testing (CBT), General Diagnostic Model (GDM), Multidimensional Item Response Theory (MIRT), Skill Profile, Test Takers, Item Design, Population Subgroups
Abstract
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.