Capitalization on item calibration error in adaptive testing

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In adaptive testing, item selection is sequentially optimized during the test. Since the optimization takes place over a pool of items calibrated with estimation error, capitalization on these errors is likely to occur. How serious the consequences of this phenomenon are depends not only on the distribution of the estimation errors in the pool or the ratio of the test length to the pool size, but also on the structure of the item selection criterion used. A simulation study demonstrated the existence of the phenomenon empirically. It also showed that its effect on the errors in the ability estimates interacts strongly with the distribution of the items in the pool.
Original languageEnglish
Place of PublicationEnschede
PublisherUniversity of Twente
Publication statusPublished - 1998

Publication series

NameOMD Research Report
PublisherUniversity of Twente, Faculty of Educational Science and Technology


  • Error of measurement
  • Estimation (Mathematics)
  • Test items
  • Ability
  • Adaptive testing
  • Foreign countries
  • Computer assisted testing


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