Precision and Recall
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- Precision is the ability to retrieve the most precise results. Higher precision means better relevance and more precise results, but may imply fewer results returned.For a query, recall means the ability to retrieve as many documents as possible that match or are related to a query. Recall may be improved by linguistic processing such as lemmatization, spell-checking, and synonym expansion. In information retrieval, there's a classic tension between recall and precision. Specifying more recall (trying to find all the relevant items), you often get a lot of junk. If you limit your search trying to find only precisely relevant items, you can miss important items because they don't use quite the same vocabulary.
FAST - Cite This Source - This Definition - Approximate matching, Exact Match, Fuzzy matching, Fuzzy Search, Linguistics, Orthographic analysis, Query transformation, Recall, Spell Check Optimization, Spell checking