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ERIC Number: EJ1111311
Record Type: Journal
Publication Date: 2008-Dec
Pages: 63
Abstractor: As Provided
ISSN: EISSN-2330-8516
Studies of a Latent-Class Signal-Detection Model for Constructed-Response Scoring. Research Report. ETS RR-08-63
DeCarlo, Lawrence T.
ETS Research Report Series, Dec 2008
Rater behavior in essay grading can be viewed as a signal-detection task, in that raters attempt to discriminate between latent classes of essays, with the latent classes being defined by a scoring rubric. The present report examines basic aspects of an approach to constructed-response (CR) scoring via a latent-class signal-detection model. The model provides a psychological framework for CR scoring and includes rater parameters with a clear cognitive basis. Simulations are used to examine how well rater parameters and latent-class sizes are recovered as well as the accuracy of classification. The relation of rater parameters to agreement statistics and classification accuracy is examined. The effects of using a balanced, incomplete block design are compared to those for a fully crossed design. The model is applied to several ETS datasets.
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Publication Type: Journal Articles; Reports - Research; Numerical/Quantitative Data
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A