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I see on this page the formula for calculation of prevalence threshold:

enter image description here

Given also are following values on that page:

Sensitivity or TPR: 66.7%
Specificity or TNR: 91%

enter image description here

With these values, I am getting a prevalence threshold of 27%. However, it is mentioned as 19% on the wiki page.

Where is the error? Thanks for your help.

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    $\begingroup$ You might want to take this up on the Wikipedia page. It's a real mess and could use some help! $\endgroup$ – whuber Jul 27 '20 at 13:51
  • $\begingroup$ It will be great if you can put some points in an answer here because most things mentioned on that page are common beliefs. $\endgroup$ – rnso Jul 27 '20 at 17:21
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    $\begingroup$ I am not claiming that page is wrong: it is just terribly laid out and confusing. (This calculation you quote does look incorrect, though.) $\endgroup$ – whuber Jul 27 '20 at 17:33

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