Using a Modified Multidimensional Priority Index for Item Selection Under Within-Item Multidimensional Computerized Adaptive Testing

  • Ya-Hui SuEmail author
  • Yen-Lin Huang
Part of the Springer Proceedings in Mathematics & Statistics book series (PROMS, volume 89)


Computerized adaptive testing (CAT) not only enables efficient and precise ability estimation but also increases the security of testing materials since examinees are given different sets of items from a large item bank. The construction of assessments usually involves fulfilling a large number of non-statistical constraints, such as item exposure control and content balancing. To improve measurement precision, test security, and test validity, the priority index (PI) and multidimensional priority index (MPI) were proposed to monitor many constraints simultaneously for unidimensional and multidimensional CATs, respectively. Many educational and psychological tests are constructed under a multidimensional framework. Some of the items (multidimensional items) in a test are often intended to assess multiple latent traits. However, Yao’s MPI method was developed for a between-item multidimensional framework. When a within-item multidimensional test is assembled, a modified MPI algorithm is necessary. Therefore, the purposes of the study were to derive an algorithm for the modified MPI method for the within-item multidimensional CATs and to investigate the efficiency of the modified MPI method through simulations.


CAT Priority index Multidimensional Item selection IRT 


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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.Department of PsychologyNational Chung Cheng UniversityChiayi CountyTaiwan

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