Specificity/sensitivity and posttest probability?

This forum made possible through the generous support of SDN members, donors, and sponsors. Thank you.

Lothric

Full Member
7+ Year Member
Joined
Aug 30, 2016
Messages
234
Reaction score
22
Hey,

Take a look at the picture below showing cutoff values:

Questions:

1. What is meant with "possible cutoff values". What is "possible" referring to here?
2. What effects on specificity and selectivity will cutoff value B have? I can't decipher that from the diagram.
3. What is meant with "posttest probability"? After a test, isn't it obvious what condition someone has? Why talk about probability when you know the results thanks to a test?

This is really confusing 🙁


222222.PNG
 
Top