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Data-driven item selection for the Shirts and Shoes Test.

Alexander Tucci1, Elena Plante1, Rebecca Vance1

  • 1The University of Arizona, 1131 E. Second St., Tucson, AZ 85721, United States.

Journal of Communication Disorders
|February 1, 2019
PubMed
Summary

Item Response Theory (IRT) effectively identifies unsuitable test items early in development. This ensures assessments for young children are valid and reliable, using 55 appropriate items from an initial pool of 74.

Keywords:
Assessment developmentItem analysisPreschool languageReceptive language

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Area of Science:

  • Psychometrics
  • Educational Measurement
  • Developmental Psychology

Background:

  • Test development requires rigorous item selection to ensure validity and reliability.
  • Early-stage item analysis is crucial for creating effective assessments.
  • The Shirts and Shoes Test aims to measure skills in young children.

Purpose of the Study:

  • To apply Item Response Theory (IRT) to refine a pool of potential test items.
  • To identify and discard unsuitable items based on IRT model deviations.
  • To establish the suitability of remaining items for a specific age group.

Main Methods:

  • Seventy-four potential items for the Shirts and Shoes Test were administered to 513 children aged 3-6 years.
  • Item Response Theory (IRT) analysis was employed to evaluate item performance.
  • Items deviating from the IRT model were identified for potential exclusion.

Main Results:

  • Nineteen items were discarded due to significant deviations in item response characteristics.
  • The remaining 55 items demonstrated a suitable range of difficulty.
  • The selected items were deemed appropriate for children aged 3 to 6 years.

Conclusions:

  • Item Response Theory is a valuable tool for improving test validity and reliability during early development.
  • Item content alone does not guarantee effective skill measurement; psychometric properties are essential.
  • This study successfully refined an item pool, enhancing the quality of the assessment.