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Advancing Dyslexia Assessment in Children Through Computerized Testing
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Published on: August 16, 2024

Relationship between assessment item format and item performance characteristics.

Stephen D Phipps1, Marcia L Brackbill

  • 1Bernard J. Dunn School of Pharmacy, Shenandoah University, Nashville, TN 37204, USA. steve.phipps@lipscomb.edu

American Journal of Pharmaceutical Education
|March 12, 2010
PubMed
Summary

Assessment item format impacts performance. Noncase-based items showed better discrimination than case-based items, though case-based items were not more difficult. Item format is key for test performance.

Keywords:
assessmentcase-baseddiscrimination indexitem analysispsychometrics

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Area of Science:

  • Educational assessment
  • Psychometrics
  • Health professions education

Background:

  • Assessment item format is crucial for evaluating student knowledge.
  • Understanding how different item formats affect performance characteristics is essential for valid and reliable assessments.

Purpose of the Study:

  • To evaluate the relationship between assessment item formats (case-based vs. noncase-based) and their performance characteristics.
  • To determine if item format influences item difficulty and discrimination.

Main Methods:

  • A total of 1,575 assessment items from therapeutics courses were analyzed.
  • Items were categorized as case-based or noncase-based.
  • Item performance characteristics, including discrimination index and difficulty level, were evaluated.

Main Results:

  • Noncase-based items constituted approximately 75% of all items and demonstrated a higher discrimination index than case-based items.
  • Case-based items, while lengthier and more detailed, were not more difficult and had a lower discrimination index.
  • Five-foil multiple-choice items were more difficult and had a higher discrimination index compared to four-foil items.

Conclusions:

  • The format of assessment items (case-based or noncase-based) significantly impacts their performance characteristics.
  • Item format choice is a critical consideration for developing effective and informative assessments.