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Related Experiment Videos

Equating and item banking with the Rasch model.

E W Wolfe1

  • 1459 Erickson Hall, Michigan State University, East Lansing, MI 48824, USA. wolfee@msu.edu

Journal of Applied Measurement
|June 22, 2002
PubMed
Summary
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This study details Rasch measurement procedures for creating comparable test forms and item banks. It covers data collection, parameter estimation, scaling, and linkage quality evaluation for accurate psychometric analysis.

Area of Science:

  • Psychometrics
  • Educational Measurement
  • Item Response Theory

Background:

  • Equating multiple test forms and calibrating item banks are crucial for standardized assessments.
  • Rasch measurement models offer a robust framework for these psychometric procedures.

Purpose of the Study:

  • To describe comprehensive Rasch measurement procedures for test form equating and item bank calibration.
  • To outline the key steps involved in ensuring measurement comparability across different test versions.

Main Methods:

  • Selecting appropriate data collection designs (e.g., anchor tests, single group).
  • Estimating parameters through separate or simultaneous calibration.
  • Transforming parameters to a common scale using estimation scaling, parameter anchoring, or equating constants.

Related Experiment Videos

  • Evaluating linkage quality using fit indices (item-within-link, item-between-link, link-within-bank, form-within-bank).

    • Main Results:

    • The described procedures provide a systematic approach to equating and calibration.
    • Anchor test design is demonstrated as an effective method for illustrating these procedures.
    • Fit indices offer quantitative measures for assessing the quality of the linkage between forms.

    Conclusions:

    • The Rasch measurement procedures outlined are essential for developing reliable and valid large-scale assessment programs.
    • Effective equating and calibration ensure score comparability and support accurate interpretation of results across different test administrations.