|March 05, 2003 [posted]|
Publication Type Mapping|
he Medical Subject Headings (MeSH) Translation Table used in PubMed's Automatic Term Mapping has been enhanced to include Publication Types (PT) and their Entry Terms. For more information about Automatic Term Mapping, please see PubMed's Help. This change will improve citation retrieval by publication type. Unqualified terms in a query will be searched as follows:
In the past, for most concepts represented by both MH and PT, when users entered an unqualified term, PubMed searched for the MH and the term entered as Text Word (TW). For example, if the user entered biography, PubMed searched for: ("biography"[MeSH Terms] OR biography[Text Word]), thus missing most citations indexed to Biography[Publication Type]. When users entered an unqualified term that was only represented by a PT, it was searched as "All Fields." As PT is included in All Fields, users retrieved citations indexed with the PT plus some false drops. A search using a PT Entry Term did not retrieve the publication type because PT Entry Terms were not recognized in PubMed. For example, Comment was not retrieved if commentary was entered.
Note: Overall is a publication type and a stopword in PubMed. Users wishing to retrieve the publication type Overall, will need to qualify their query (e.g., overall[pt]).
By Norma I. Ruiz
Ruiz NI. PubMed®: Publication Type Mapping. NLM Tech Bull. 2003 Mar-Apr;(331):e1.