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RS Book CH 31

RS Book Ch 31

what is a search engine? information retreval systems that search the Internet and electronic databases for websites, files or documents based on keyword or phrases.
Databases are organized systemss that allow search access for specific content or information.
Boolean logic: utilizes three primary operators: AND, NOT, and OR
AND does what to the search narrows it
OR does what to the search? broadens the search
NOT does what to the search excludes concepts from the search
National Library of Medicine: Medical Subject Headings (MeSH) terms: consists of sets of termis in a hierarchical structure or "tree" taht permits searchin at various levles of specificity
Science Citation Index: a reference system that allows researchers to search based on citations, by traking literature forward or backward, and across diciplinary boundries.
recall: the proprotion of retrieved citation that are releant or the likelihood of finding relevant references.
Precision (for citations) is the proportion of citation that are relevant that the search is able to retrieve, or the likelyhood of excluding irrelevant references.
Created by: NicoleB
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