What is fallout?

fallout meaning in Information Science terminology / glossary / dictionary is:

A measure of the effectiveness of information retrieval, computed as the ratio of nonrelevant entries or items retrieved in response to a query to the total number of nonrelevant items indexed in the database (adapted from the ASIS Thesaurus of Information Science and Librarianship, Information Today, 1998). As a practical matter, the number of nonrelevant items in a given database is often difficult (if not impossible) to ascertain, except in very small databases, so this measure remains largely conceptual. See also: precision and recall.


reference: ABC-CLIO