Abstract:
BACKGROUND:The use of the borderline regression method (BRM) is a widely accepted standard setting method for OSCEs. However, it is unclear whether this method is appropriate for use with small cohorts (e.g. specialist post-graduate examinations). AIMS AND METHODS:This work uses an innovative application of resampling methods applied to four pre-existing OSCE data sets (number of stations between 17 and 21) from two institutions to investigate how the robustness of the BRM changes as the cohort size varies. Using a variety of metrics, the 'quality' of an OSCE is evaluated for cohorts of approximately n = 300 down to n = 15. Estimates of the standard error in station-level and overall pass marks, R(2) coefficient, and Cronbach's alpha are all calculated as cohort size varies. RESULTS AND CONCLUSION:For larger cohorts (n > 200), the standard error in the overall pass mark is small (less than 0.5%), and for individual stations is of the order of 1-2%. These errors grow as the sample size reduces, with cohorts of less than 50 candidates showing unacceptably large standard error. Alpha and R(2) also become unstable for small cohorts. The resampling methodology is shown to be robust and has the potential to be more widely applied in standard setting and medical assessment quality assurance and research.
journal_name
Med Teachjournal_title
Medical teacherauthors
Homer M,Pell G,Fuller R,Patterson Jdoi
10.3109/0142159X.2015.1029898subject
Has Abstractpub_date
2016-01-01 00:00:00pages
181-8issue
2eissn
0142-159Xissn
1466-187Xjournal_volume
38pub_type
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