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Comments on: My latest Slate article https://garycornell.com/2021/12/18/my-latest-slate-article/ - with an occasional random thought on random topics. All material is owned and copyrighted © by Gary Cornell but may be freely quoted Sat, 15 Jan 2022 17:54:08 +0000 hourly 1 https://wordpress.org/?v=6.5.3 By: admn https://garycornell.com/2021/12/18/my-latest-slate-article/#comment-600 Sat, 15 Jan 2022 17:54:08 +0000 https://garycornell.com/?p=691#comment-600 In reply to NS.

A test with no false positives has 100% positive predictive value. 
PPV is defined as TP/(TP +FP)If FP = 0, then PPV is 1
(It is very unusual I admit for a test to have no false positives…)
I wanted to add a discussion of PPV and NPV but they said no. It will hopefully be in another article.

]]> By: NS https://garycornell.com/2021/12/18/my-latest-slate-article/#comment-599 Sat, 15 Jan 2022 16:49:17 +0000 https://garycornell.com/?p=691#comment-599 You need to correct that article ASAP. You literally reversed sensitivity and specificity. It is deeply misleading, in fact rapid tests have a much better negative predictive value than positive predictive value.

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