What does recall mean in Machine Learning?

Question

I know that the meaning of recall in search engine, but what\'s the meaning of recall of a classifier, e.g. bayes classifier? please give a an example, thanks.

for examp

Answer 1

These terminologies actually come from signal detection theory. For details, see http://en.wikipedia.org/wiki/Receiver_operating_characteristic

On the right, under "Terminology and derivations from a confusion matrix".