Internal validation of risk models in lung resection surgery: Bootstrap versus training- and-test sampling Alessandro Brunelli, MD, Gaetano Rocco, MD

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Internal validation of risk models in lung resection surgery: Bootstrap versus training- and-test sampling Alessandro Brunelli, MD, Gaetano Rocco, MD The Journal of Thoracic and Cardiovascular Surgery Volume 131, Issue 6, Pages 1243-1247 (June 2006) DOI: 10.1016/j.jtcvs.2006.02.002 Copyright © 2006 The American Association for Thoracic Surgery Terms and Conditions

Figure 1 Distribution of the receiver operating characteristic (ROC) areas of each model derived from unit A in 1000 bootstrap samples drawn from unit B. The Journal of Thoracic and Cardiovascular Surgery 2006 131, 1243-1247DOI: (10.1016/j.jtcvs.2006.02.002) Copyright © 2006 The American Association for Thoracic Surgery Terms and Conditions