Cut-scores revisited: feasibility of a new method for group standard setting

Authors

Boaz Shulruf, University of New South Wales
Lee Coombes, Cardiff University
Arvin Damodaran, University of New South Wales
Adrian Freeman, University of Exeter
Philip Jones, University of New South Wales
Steve Lieberman, University of texas
Phillippa Poole, University of Auckland
Joel J. Rhee, University of New South WalesFollow
Tim Wilkinson, University of Otago
Peter Harris, University of New South Wales

RIS ID

130678

Publication Details

Shulruf, B., Coombes, L., Damodaran, A., Freeman, A., Jones, P., Lieberman, S., Poole, P., Rhee, J., Wilkinson, T. & Harris, P. (2018). Cut-scores revisited: feasibility of a new method for group standard setting. BMC Medical Education, 18 (1), 126-1-126-8.

Abstract

Background: Standard setting is one of the most contentious topics in educational measurement. Commonly-used methods all have well reported limitations. To date, there is not conclusive evidence suggesting which standard setting method yields the highest validity. Methods: The method described and piloted in this study asked expert judges to estimate the scores on a real MCQ examination that they consider indicated a clear pass, clear fail, and pass mark for the examination as a whole. The mean and SD of the judges responses to these estimates, Z scores and confidence intervals were used to derive the cut-score and the confidence in it. Results: In this example the new method's cut-score was higher than the judges' estimate. The method also yielded estimates of statistical error which determine the range of the acceptable cut-score and the estimated level of confidence one may have in the accuracy of that cut-score. Conclusions: This new standard-setting method offers some advances, and possibly advantages, in that the decisions being asked of judges are based on firmer constructs, and it takes into account variation among judges.