2
$\begingroup$

As far as I understood, we plot the (False positive Rate, True Positive Rate) points for all values of threshold. Why should this curve be increasing always? (or non-decreasing)

$\endgroup$
1
  • $\begingroup$ Because both false positive rate and true positive rate are monotonically decreasing functions of the classification threshold. $\endgroup$ Jan 6 '16 at 9:09
4
$\begingroup$

(WLOG) Because no case which is classified as a positive will ever be classified as a negative for any lower threshold.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.