Searching the web effectively f09

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Searching the web lecture

Searching the web lecture

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  • 1. EDT 251 October 22, 2009
  • 2.  Where do you go?  Are you happy with the results?  Whatdo you think makes the searching experience work well?
  • 3.  Google – 65%  Yahoo! – 19%  Bing – 9%  Ask.com – 2% and Ask Kids  Ixquick  Clusty  Librarians’ Internet Index  Google Directory  http://infopeople.org/search/chart.html
  • 4.  Searchengines use software (“robots” or “spiders”) to index some amount of Web pages • Proprietary algorithms • Google claims over a trillion URLs searched • Paid placement of ads provides revenue • Currency – how frequently do they add sites?  Other tools add human-collected or human- submitted sites (Google and Yahoo directories) • These are then searched by subject or keyword • Tend to be smaller in size  Relevance ranking of results
  • 5.  AKA the “Deep Web”  Resourcesthat are not indexed by search engines (such as library databases)  InfoMINE– indexes free-standing databases  Add term “database” to your topic in Google or Yahoo
  • 6.  Scholarly information subset of Google: http://scholar.google.com  Many journal articles included on publisher’s web sites  Set up “Scholar Preferences”  Library Links  enter “OhioLINK” and click to check the box  Look for “Find it with OLinks” or “OhioLINK OLinks” links in results
  • 7.  Online encyclopedia of over 3 million articles  Built using a wiki – allows for multiple contributors  How does it work?  What are the cautions?
  • 8. 1. Identify the important concepts 2. Choose keywords 3. Pick synonyms and related terms 4. Think about using quotes, truncation, Boolean 5. Choose a search engine 6. Read the instructions (most rules are the same, but not all) 7. Enter your search expression 8. Evaluate the results 9. Modify/narrow your search (if needed) 10. Move to a new search engine (if needed)
  • 9.  Crucial because of fluidity/lack of standards  Some possible criteria for any source: • Who wrote or created the source? • What audience was the source written for? • Where did you (or can you) find the source? • When was the source written or created? • Why was the source written? • How can you verify the information contained in the source?  Look carefully at URL (.com, .edu, etc.)