202602250159
Status: #reference
Tags: Information Retrieval
State: #nascient

Coverage Ratio

This is one of the more subjective metrics used to evaluate the performance of a retrieval system. It essentially puts the known documents of the user as the set of relevant documents in existence, and we check against this set, how many did we retrieve.

It is computed as follows:

C o v e r a g e R a t i o = \frac{| r e t r i e v e d r e l e v a n t d o c u m e n t s k n o w n b y u s e r |}{| r e l e v a n t d o c u m e n t s k n o w n b y u s e r |}

Relevant Links

File	Folder	Last Modified
Novelty Ratio	1. Cosmos	2:04 AM - February 25, 2026