ttp://cran.cnr.berkeley.edu/web/packages/HSROC/vignettes/Tutorial.pdf
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We start with the simplest mode, where the reference test is assumed to be a gold standard
(i.e. sensitivity and specificity of the reference test both equal to 100%).
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ttp://www.siue.edu/~sumbaug/RetinalProjectPapers/A%20comparison%20of%20computer%20based%20classification%20methods%20applied%20to%20the%20detection%20of%20microaneurysms%20in%20ophthalmic%20fluorescein%20angiograms.pdf
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An ideal classifier would give 100% sensitivity and 100% specificity, when tested against the
gold standard.
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ttp://calder.med.miami.edu/pages/EBMGlossary.pdf
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For diagnosis, it refers to a reference standard for the evaluation of a diagnostic test. For the purposes of a study, the "gold standard" test is assumed to have 100% sensitivity and specificity. This may well constitute an exaggerated estimate of the reference test.
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