Title page for ETD etd-05092004-213057


Type of Document Dissertation
Author Wagner, Teresa Ann
URN etd-05092004-213057
Title Item Exposure issues in the Wagner Assessment Test: A Computer Adaptive Testing Approach
Degree PhD
Department Psychology
Advisory Committee
Advisor Name Title
Harvey, Robert J. Committee Chair
Bell, Martha Ann Committee Member
Carlson, Kevin D. Committee Member
Crawford, Helen J. Committee Member
Skaggs, Gary E. Committee Member
Keywords
  • Item Exposure
  • Critical Thinking
  • WAT
  • Wagner Assessment Test
  • Computer Adaptive Testing
  • CAT
Date of Defense 2004-04-30
Availability unrestricted
Abstract
The performance of the Wagner Assessment Test (WAT; Wagner & Harvey, in press) when administered using computer adaptive testing (CAT) methods was examined using the original 103-item WAT pool and an expanded 263-item pool. Although previous research (e.g., Wagner & Harvey, in press) has shown that the WAT outperforms the Watson Glaser Critical Thinking Appraisal (WGCTA; Watson & Glaser, 1980) in terms of test information, standard error, and susceptibility to successful guessing, it was hypothesized that a significant lengthening of the WAT item pool would be necessary in order to achieve acceptable CAT item-exposure rates. Using item parameters derived in an N = 423 college-student sample, Monte Carlo methods were used to conduct CAT sessions in an N = 5,000 sample of simulated raters; theta estimation accuracy and item-exposure levels at test lengths of 20, 40, and 60 items were examined. Results indicated that both b-blocking a-stratified (BAS) and Fisher maximum-information (FMI) methods of item selection exhibited strong convergence with the true theta scores; however, only BAS yielded acceptable item-exposure rates in CAT tests of these lengths.
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