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ERIC Number: EJ1111290
Record Type: Journal
Publication Date: 2008-Feb
Pages: 21
Abstractor: As Provided
ISSN: EISSN-2330-8516
Linking for the General Diagnostic Model. Research Report. ETS RR-08-08
Xu, Xueli; von Davier, Matthias
ETS Research Report Series, Feb 2008
Three strategies for linking two consecutive assessments are investigated and compared by analyzing reading data for the National Assessment of Educational Progress (NAEP) using the general diagnostic model. These strategies are compared in terms of marginal and joint expectations of skills, joint probabilities of skill patterns, and item parameter estimates. The results indicate that fixing item parameter values at their previously calibrated values is sufficient to establish a comparable scale for the subsequent year.
Educational Testing Service. Rosedale Road, MS19-R Princeton, NJ 08541. Tel: 609-921-9000; Fax: 609-734-5410; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Research
Education Level: Grade 4; Intermediate Grades; Elementary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Assessments and Surveys: National Assessment of Educational Progress
Grant or Contract Numbers: N/A