Scoring method of a Situational Judgment Test: influence on internal consistency reliability, adverse impact and correlation with personality?

W. E. De Leng (Lead / Corresponding author), K. M. Stegers-Jager, A. Husbands, J. S. Dowell, M. Ph. Born, A. P. N. Themmen

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)
269 Downloads (Pure)

Abstract

Situational Judgment Tests (SJTs) are increasingly used for medical school selection. Scoring an SJT is more complicated than scoring a knowledge test, because there are no objectively correct answers. The scoring method of an SJT may influence the construct and concurrent validity and the adverse impact with respect to non-traditional students. Previous research has compared only a small number of scoring methods and has not studied the effect of scoring method on internal consistency reliability. This study compared 28 different scoring methods for a rating SJT on internal consistency reliability, adverse impact and correlation with personality. The scoring methods varied on four aspects: the way of controlling for systematic error, and the type of reference group, distance and central tendency statistic. All scoring methods were applied to a previously validated integrity-based SJT, administered to 931 medical school applicants. Internal consistency reliability varied between .33 and .73, which is likely explained by the dependence of coefficient alpha on the total score variance. All scoring methods led to significantly higher scores for the ethnic majority than for the non-Western minorities, with effect sizes ranging from 0.48 to 0.66. Eighteen scoring methods showed a significant small positive correlation with agreeableness. Four scoring methods showed a significant small positive correlation with conscientiousness. The way of controlling for systematic error was the most influential scoring method aspect. These results suggest that the increased use of SJTs for selection into medical school must be accompanied by a thorough examination of the scoring method to be used.

Original languageEnglish
Pages (from-to)243-265
Number of pages23
JournalAdvances in Health Sciences Education
Volume22
Issue number2
Early online date18 Oct 2016
DOIs
Publication statusPublished - May 2017

Keywords

  • Situational Judgment Test
  • Scoring method
  • Medical school selection
  • Internal consistency reliability
  • Adverse impact
  • Integrity
  • Big Five

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