An Item Response Theory–Based, Computerized Adaptive Testing Version of the MacArthur–Bates Communicative Development Inventory: Words & Sentences (CDI:WS) Purpose This study investigated the feasibility and potential validity of an item response theory (IRT)–based computerized adaptive testing (CAT) version of the MacArthur–Bates Communicative Development Inventory: Words & Sentences (CDI:WS; Fenson et al., 2007) vocabulary checklist, with the objective of reducing length while maintaining measurement precision. Method Parent-reported ... Research Article
Research Article  |   April 01, 2016
An Item Response Theory–Based, Computerized Adaptive Testing Version of the MacArthur–Bates Communicative Development Inventory: Words & Sentences (CDI:WS)
 
Author Affiliations & Notes
  • Guido Makransky
    University of Southern Denmark, Odense
  • Philip S. Dale
    University of New Mexico, Albuquerque
  • Philip Havmose
    University of Southern Denmark, Odense
  • Dorthe Bleses
    Centre for Child Language, Aarhus University, Denmark
  • Disclosure: The authors have declared that no competing interests existed at the time of publication.
    Disclosure: The authors have declared that no competing interests existed at the time of publication. ×
  • Correspondence to Guido Makransky: gmakransky@health.sdu.dk
  • Editor: Rhea Paul
    Editor: Rhea Paul×
  • Associate Editor: Stephanie Stokes
    Associate Editor: Stephanie Stokes×
Article Information
Development / Research Issues, Methods & Evidence-Based Practice / Telepractice & Computer-Based Approaches / Language / Research Articles
Research Article   |   April 01, 2016
An Item Response Theory–Based, Computerized Adaptive Testing Version of the MacArthur–Bates Communicative Development Inventory: Words & Sentences (CDI:WS)
Journal of Speech, Language, and Hearing Research, April 2016, Vol. 59, 281-289. doi:10.1044/2015_JSLHR-L-15-0202
History: Received June 4, 2015 , Revised August 17, 2015 , Accepted August 29, 2015
 
Journal of Speech, Language, and Hearing Research, April 2016, Vol. 59, 281-289. doi:10.1044/2015_JSLHR-L-15-0202
History: Received June 4, 2015; Revised August 17, 2015; Accepted August 29, 2015
Web of Science® Times Cited: 2

Purpose This study investigated the feasibility and potential validity of an item response theory (IRT)–based computerized adaptive testing (CAT) version of the MacArthur–Bates Communicative Development Inventory: Words & Sentences (CDI:WS; Fenson et al., 2007) vocabulary checklist, with the objective of reducing length while maintaining measurement precision.

Method Parent-reported vocabulary for the American CDI:WS norming sample consisting of 1,461 children between the ages of 16 and 30 months was used to investigate the fit of the items to the 2-parameter logistic IRT model and to simulate CDI-CAT versions with 400, 200, 100, 50, 25, 10, and 5 items.

Results All but 14 items fit the 2-parameter logistic IRT model, and real data simulations of CDI-CATs with at least 50 items recovered full CDI scores with correlations over .95. Furthermore, the CDI-CATs with at least 50 items had similar correlations with age and socioeconomic status as the full CDI:WS.

Conclusion These results provide strong evidence that a CAT version of the CDI:WS has the potential to reduce length while maintaining the accuracy and precision of the full instrument.

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