Document Type

Presented Paper

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Publication Date

4-2016

Abstract

Calibration data often is often collected within schools. This illustration shows that random school effects for ability do not bias IRT parameter estimates or their standard errors. However, random school effects for item difficulty lead to bias in item discrimination estimates and inflated standard errors for difficulty and ability.

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