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[Item parameter drift in computerized adaptive testing: Study with eCAT].

Francisco J Abad1, Julio Olea, David Aguado

  • 1Facultad de Psicología, Universidad Autónoma de Madrid, Madrid, Spain. fjose.abad@uam.es

Psicothema
|April 29, 2010
PubMed
Summary
This summary is machine-generated.

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Parameter drift was detected in the eCAT (Computerized Adaptive Test) item bank, particularly affecting item parameters and causing differential item functioning. New calibrations are recommended to improve English proficiency estimates for Spanish speakers.

Area of Science:

  • Educational Measurement
  • Psychometrics
  • Applied Linguistics

Context:

  • The eCAT (Computerized Adaptive Test) is used to assess the written English proficiency of Spanish speakers.
  • Item bank calibration is crucial for the accuracy of adaptive testing.
  • Monitoring parameter stability over time is essential for maintaining test validity.

Purpose:

  • To analyze parameter drift in the eCAT item bank by comparing original and updated calibrations.
  • To identify items exhibiting Differential Item Functioning (DIF) between calibrations.
  • To evaluate the impact of parameter changes on English proficiency estimates.

Summary:

  • A parameter drift analysis was performed on the eCAT item bank, comparing an initial calibration (N=3224) with a more recent one (N=7254).

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  • Differential Item Functioning (DIF) analysis revealed significant differences between the two calibrations for numerous items, especially impacting the 'a' (discrimination) and 'c' (guessing) parameters.
  • Simulations indicated that the updated parameters moderately affect the estimation of high-level English proficiency.

    • Impact:

    • The study recommends replacing original item parameters with the newly calibrated set to enhance the accuracy of eCAT English proficiency assessments.
    • Findings highlight the importance of regular recalibration in Computerized Adaptive Testing (CAT) to account for parameter drift.
    • Improved parameter estimates can lead to more precise and reliable measurement of written English skills for Spanish-speaking learners.