Optimal Combinations of Diagnostic Tests Based on AUC

Biometrics. 2011 Jun;67(2):568-76. doi: 10.1111/j.1541-0420.2010.01450.x. Epub 2010 Jun 16.


When several diagnostic tests are available, one can combine them to achieve better diagnostic accuracy. This article considers the optimal linear combination that maximizes the area under the receiver operating characteristic curve (AUC); the estimates of the combination's coefficients can be obtained via a nonparametric procedure. However, for estimating the AUC associated with the estimated coefficients, the apparent estimation by re-substitution is too optimistic. To adjust for the upward bias, several methods are proposed. Among them the cross-validation approach is especially advocated, and an approximated cross-validation is developed to reduce the computational cost. Furthermore, these proposed methods can be applied for variable selection to select important diagnostic tests. The proposed methods are examined through simulation studies and applications to three real examples.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Area Under Curve*
  • Bias
  • Computer Simulation
  • Diagnostic Techniques and Procedures / standards*
  • Diagnostic Techniques and Procedures / statistics & numerical data
  • Humans
  • Methods