Question - Describe Precision and Recall?
Answer -
Precision and Recall both are the measures which are used in the information retrieval domain to measure how good an information retrieval system reclaims the related data as requested by the user.
Precision can be said as a positive predictive value. It is the fraction of relevant instances among the received instances.
On the other side, recall is the fraction of relevant instances that have been retrieved over the total amount or relevant instances. The recall is also known as sensitivity.