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Biometrics. 2007 Dec;63(4):1181-8. Epub 2007 May 8.

Evaluating the predictiveness of a continuous marker.

Author information

1
University of Washington Biostatistics Department, F-600 Health Sciences Building, Box 357232, Seattle, Washington 98195-7232, USA.

Abstract

Consider a continuous marker for predicting a binary outcome. For example, the serum concentration of prostate specific antigen may be used to calculate the risk of finding prostate cancer in a biopsy. In this article, we argue that the predictive capacity of a marker has to do with the population distribution of risk given the marker and suggest a graphical tool, the predictiveness curve, that displays this distribution. The display provides a common meaningful scale for comparing markers that may not be comparable on their original scales. Some existing measures of predictiveness are shown to be summary indices derived from the predictiveness curve. We develop methods for making inference about the predictiveness curve, for making pointwise comparisons between two curves, and for evaluating covariate effects. Applications to risk prediction markers in cancer and cystic fibrosis are discussed.

PMID:
17489968
PMCID:
PMC3059154
DOI:
10.1111/j.1541-0420.2007.00814.x
[Indexed for MEDLINE]
Free PMC Article
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