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RS Book CH 31
RS Book Ch 31
Question | Answer |
---|---|
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. |