A sequential classification rule based on multiple quantitative tests in the absence of a gold standard

Jingyang Zhang, Ying Zhang, Kathryn Chaloner, Jack T. Stapleton

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

In many medical applications, combining information from multiple biomarkers could yield a better diagnosis than any single one on its own. When there is a lack of a gold standard, an algorithm of classifying subjects into the case and non-case status is necessary for combining multiple markers. The aim of this paper is to develop a method to construct a composite test from multiple applicable tests and derive an optimal classification rule under the absence of a gold standard. Rather than combining the tests, we treat the tests as a sequence. This sequential composite test is based on a mixture of two multivariate normal latent models for the distribution of the test results in case and non-case groups, and the optimal classification rule is derived returning the greatest sensitivity at a given specificity. This method is applied to a real-data example and simulation studies have been carried out to assess the statistical properties and predictive accuracy of the proposed composite test. This method is also attainable to implement nonparametrically.

Original languageEnglish (US)
Pages (from-to)1359-1372
Number of pages14
JournalStatistics in Medicine
Volume35
Issue number8
DOIs
StatePublished - Apr 15 2016

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Keywords

  • Diagnostic test
  • EM algorithm
  • Mixture model
  • Multivariate normal

ASJC Scopus subject areas

  • Epidemiology
  • Statistics and Probability

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