Item parameter drift in computerized adaptive testing: Study with eCAT

Francisco José Abad, Julio Olea, David Aguado, Vicente Ponsoda, Juan Ramón Barrada

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

Abstract

Item parameter drift in computerized adaptive testing: Study with eCAT. This study describes the parameter drift analysis conducted on eCAT (a Computerized Adaptive Test to assess the written English level of Spanish speakers). The original calibration of the item bank (N = 3224) was compared to a new calibration obtained from the data provided by most eCAT operative administrations (N = 7254). A Differential Item Functioning (DIF) study was conducted between the original and the new calibrations. The impact that the new parameters have on the trait level estimates was obtained by simulation. Results show that parameter drift is found especially for a and c parameters, an important number of bank items show DIF, and the parameter change has a moderate impact on high-level-English θ estimates. It is then recommended to replace the original estimates by the new set. © 2010 Psicothema.
Original languageEnglish
Pages (from-to)340-347
JournalPsicothema
Volume22
Issue number2
Publication statusPublished - 17 Jun 2010

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