A model for optimal constrained adaptive testing

Wim J. van der Linden, Lynda M. Reese

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Abstract

A model for constrained computerized adaptive testing is proposed in which the information on the test at the ability estimate is maximized subject to a large variety of possible constraints on the contents of the test. At each item-selection step, a full test is first assembled to have maximum information at the current ability estimate fixing the items previously administered. Then the item with maximum information is selected from the test. All test assembly is optimal due to the use of a linear programming model that is automatically updated to allow for the attributes of the items already administered as well as the new value of the ability estimator. A simulation study using a pool of 753 items from the Law School Admission Test (LSAT) shows that for adaptive tests of realistic lengths the ability estimator did not suffer any loss of efficiency from the presence of 433 constraints on the item selection process.
Original languageEnglish
Place of PublicationNewton, PA, USA
PublisherLaw School Admission Council
Publication statusPublished - 2001

Publication series

NameLSAC research report series
PublisherLaw School Admission Council
No.97-07

Keywords

  • Computer Assisted Testing
  • IR-103570
  • Adaptive Testing
  • Ability
  • College Entrance Examinations
  • Simulation
  • Models
  • Estimation (Mathematics)
  • Law Schools

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