title: Composite score validity in clerkship grading.
abstract: BACKGROUND
  Composite score validity depends on its reliability, content, and comparison with other outcomes measures. This study examined all three aspects of a composite score used in a third-year surgery clerkship.
  
  
  METHODS
  Composite score reliability was calculated using stratified alpha; several other reasonable composite combinations were tested. Correlation coefficients between clerkship composite scores and grades were calculated with other achievement measures. Two consecutive years were studied (N = 162, N = 159).
  
  
  RESULTS
  The clerkship composite score reliability was .76 (Year 1) and .81 (Year 2). Positive correlations (P <or= .05) were found between composite scores and other clerkships' test scores and the United States Medical Licensing Examination Step 2 Clinical Knowledge examination. Positive correlations (P <or= .05) were found between surgery clerkship grades and other clerkship grades.
  
  
  CONCLUSIONS
  This study documents the reliability of a composite score and provides evidence for its validity in a surgery clerkship.
authors.affiliation: j-corcoran1@northwestern.edu
authors.forename: Julia
authors.initials: J
authors.lastname: Corcoran
authors.forename: Steven M
authors.initials: SM
authors.lastname: Downing
authors.forename: Ara
authors.initials: A
authors.lastname: Tekian
authors.forename: Debra A
authors.initials: DA
authors.lastname: DaRosa
mesh_terms: D002982:Clinical Clerkship; D004521:Educational Measurement / Q000706:statistics & numerical data*; D015203:Reproducibility of Results