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Validating standard setting with a modified nedelsky procedure through common item test equating

R M Smith1, L J Gross

  • 1Rehabilitation Foundation Inc., Wheaton, IL 60189, USA.

Journal of Outcome Measurement
|January 1, 1997
PubMed
Summary
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This study validated cut scores for a basic science exam using Rasch common item equating. Results show judged cut scores were stable and within equating error across five administrations.

Area of Science:

  • Medical Education
  • Psychometrics
  • Educational Measurement

Background:

  • Validating cut scores for high-stakes tests is challenging due to limited common items between forms.
  • Common item equating offers a method to assess score stability over time with a stable item pool.

Purpose of the Study:

  • To evaluate the stability of cut scores determined by the modified Nedelsky procedure.
  • To compare judged cut scores with equated cut scores derived from Rasch common item equating.

Main Methods:

  • Analysis of five forms of a basic science examination over three years.
  • Application of the Rasch common item equating technique.
  • Comparison of modified Nedelsky procedure cut scores with Rasch-equated cut scores.

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Main Results:

  • The modified Nedelsky procedure cut scores demonstrated stability across five administrations.
  • Judged cut scores were consistently within the equating error of Rasch-equated scores.
  • The Rasch common item equating technique provided a reliable method for stability analysis.

Conclusions:

  • Cut scores set using the modified Nedelsky procedure are stable and reliable for this basic science examination.
  • Common item equating using the Rasch model is a viable method for validating judged cut scores in large-scale assessments.
  • This methodology supports the consistency of performance standards in high-stakes testing programs.