CAT Field-Test Item Calibration Sample Size: How Large is Large under the Rasch Model?
Keywords:
field-test item calibration, calibration sample size, computerized adaptive test, pretest item calibration, WINSTEPS
Abstract
This study was conducted in an attempt to provide guidelines for practitioners regarding the optimal minimum calibration sample size for pretest item estimation in the computerized adaptive test CAT under WINSTEPS when the fixed-person-parameter estimation method is applied to derive pretest item parameter estimates The field-testing design discussed in this study is a form of seeding design commonly used in the large-scale CAT programs Under such as seeding design field-test FT items are stored in an FT item pool and a predetermined number of them are randomly chosen from the FT item pool and administered to each individual examinee This study recommends focusing on the valid cases VCs that each item may end up with given a certain calibration sample size when the FT response data are sparse and introduces a simple strategy to identify the relationship between VCs and calibration sample size From a practical viewpoint when the minimum number of valid cases reaches 250 items parameters are recovered quite well across a wide range of the scale Implications of the results are also discussed
Downloads
- Article PDF
- TEI XML Kaleidoscope (download in zip)* (Beta by AI)
- Lens* NISO JATS XML (Beta by AI)
- HTML Kaleidoscope* (Beta by AI)
- DBK XML Kaleidoscope (download in zip)* (Beta by AI)
- LaTeX pdf Kaleidoscope* (Beta by AI)
- EPUB Kaleidoscope* (Beta by AI)
- MD Kaleidoscope* (Beta by AI)
- FO Kaleidoscope* (Beta by AI)
- BIB Kaleidoscope* (Beta by AI)
- LaTeX Kaleidoscope* (Beta by AI)
How to Cite
Published
2015-01-15
Issue
Section
License
Copyright (c) 2015 Authors and Global Journals Private Limited
This work is licensed under a Creative Commons Attribution 4.0 International License.