Page 181 - DLIS405_INFORMATION_STORAGE_AND_RETRIEVAL

Information Storage and Retrieval

Notes Ongoing: “On Search: Precision and Recall”

RT Recall
Specificity

Preferred Term
SN The vocabulary term in a controlled vocabulary used to tag content.
RT Broader Term
Narrower Term
Variant Term

Recall
SN A ratio that measures the success of a search. Recall is defined mathematically as the number of
relevant items returned by a search divided by the total number of relevant items in the collection.
Thus, a search that returned all the relevant items in a collection would have a recall of 1.0.
Recall can be increased by the use of synonym rings and variant terms. Recall usually has an inverse
relationship to precision. That is, increasing the recall of a search usually decreases the precision.
For more information, see:
IAWiki: “Recall vs. Precision”
Ongoing: “On Search: Precision and Recall”
RT Precision
Variant Terms

Related Term
SN Vocabulary terms in a controlled vocabulary that are closely related. That is, they refer to closely
related concepts. Abbreviated in displays as “RT.” Related terms may, for example, exhibit the
following relationships:
field of study/objects studied
operation/agent
action/product of action
concepts/properties
agent/counter-agent
concept/opposite
UF “See Also” Term
RT Associative Relationship

Scope Note

SN (1) A definition of a preferred term in a controlled vocabulary. (2) An indication of restrictions
in meaning or other clarification needed for the proper use of the preferred term. Abbreviated in
displays as “SN.” Examples of scope notes are provided throughout this glossary.
RT Preferred Term
USE Related Term

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