Positive and Negative Predictive Values

Moving beyond sensitivity and specificity

[@jaymalik1943]

Excellent explanation of the topic. Well done.

[@Tahrrr]

@10:16 working across the rows wouldn't the NPV be 7/17 = 41.2% rather than 7/19 = 36.8% as you have listed?

[@powerlinkers]

thank you. simple explanation.

[@medo1626]

Thank you. I really understand your presentation and it make sense for me for the first time

[@Mariavangelderrealtor]

shouldn't it be 7/17 for npv?

[@dinkay17]

Hi Professor Campo, the numbers during 8:42 don't seem to make sense, across the rows. Since 82+1= 83, not 81. I think it was supposed to be 80TP and 12 FN to even the numbers out. Please let me know if I'm missing something. This is Diana Y.

[@olah4665]

Did the post-test probability video ever happen?

[@prydefonbah4436]

All questions; theory and practical applications answered.

[@katendedan1764]

very helpful

[@narjesseghatoleslam5307]

Dear Dr. Campo, I did two different test for detection of a bacteria in the same population. Is it possible to calculate PPV, NPV, Sensitivity and Specificity of each test Separately with out gold standard ? Could you guide me please. Thank you for your consideration and confirmation would be appreciated. Sincerely, Narjes

[@marccampo6558]

There are statistical techniques, such as latent class analysis, that can be used when there is no gold standard. But I am not familiar enough with the technique to guide you further.