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Search engine strategies 8 04


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  • 1. Uploaded by: CarAutoDriver Search Engine Strategies . . . Beyond Yahoo and Google Presented by Linda J. Goff, Head, Instructional Services CSUS LibraryLJG 8/11/04 Fall, 2004
  • 2. Today’s Agenda Web Structure, Jargon & definitions. How search engines think and work. Picking the right web search tool. Searching techniques & tips. Evaluating your sources - thinking critically about information. Demonstration.CSUS LibraryInstructionFall 2004
  • 3. Glossary blogging Metasearch browser Invisible Web cache phishing cookies portal sites html SacLink telnet http URL hypertext linkCSUS LibraryInstructionFall 2004
  • 4. What is the World Wide Web? The World Wide Web (WWW) is a global interactive, dynamic, cross-platform, graphical hypertext information system that runs on the Internet.CSUS LibraryInstructionFall 2004
  • 5. The Web is Growing Exponentially Over 10% of World is connected! Internet users estimated to be 605.60 million as of September 2002.CSUS Library Source: 2004
  • 6. 3 Main Types of Search Tools:... Web Directory - Hierarchical - organized in a classification system. Standard Search Engine – uses mathematical algorithms and boolean searches for keyword searches Expert Pages – reviewed list.CSUS LibraryInstructionFall 2004
  • 7. Expert Pages Infomine - Scholarly Internet Resource Collection Librarians Index to the Internet Information You Can Trust The WWW Virtual Library CSUS Librarian Guides: LibraryInstructionFall 2004
  • 8. Now Web search tools can ... Search multiple search engines simultaneously. Find sites that answer natural language questions. Ranks sites by how many links have been made to them. Sorts matches into folders by categories. Have advanced searching featuresCSUS LibraryInstruction Or - a combination of the above.Fall 2004
  • 9. Metasearch engines Search simultaneously across multiple search engines and displays top sites in each: – – Warning: Some now charge for higher listings, e.g., OvertureCSUS LibraryInstructionFall 2004
  • 10. Natural Language Search Type your questions in Natural Language, e.g., Analyzes words, grammar and syntax, and uses "templatics" to look for patterns in the way questions are asked. Jeeves responds with one or more closely related questions that it already knows the answer to.CSUS LibraryInstructionFall 2004
  • 11. Part 2How SearchEngines Think Search Enginesand Work
  • 12. Most search engines and databases use Boolean Operators to create search statements, e.g. (domestic or family) and (violence not sexual abuse)CSUS LibraryInstructionFall 2004
  • 13. Boolean OperatorsAND requires both terms toappear in the items that areretrieved.OR requires either term toappear in the items that areretrieved.NOT excludes a term.
  • 14. Boolean Search Strategy a AND b a family and violence b a OR c a family or domestic c b NOT d b bviolence not sexual abuse d
  • 15. What Search Engines Don’t Search „Bots only crawl the visible web which is only about 20% of everything that is on the Internet. They don‟t look at the “Deep Web”, or “The Invisible Web.”CSUS LibraryInstructionFall 2004
  • 16. Invisible Web contains Commercial databases that charge a fee, e.g., library research databases of periodical articles. Sites that require membership or a login. Searchable pages such as catalogs, phone books or directories, e.g.AMA Physician Search.CSUS LibraryInstructionFall 2004
  • 17. Library Databases Access Authentication automatic for users with Web access via CSUS and SacLink. CSUS users with other Internet Service Providers (AOL, Prodigy etc.) must create a P.I.N. in EUREKA for authentication to access Library databases. To connect from off campus go to LibraryInstructionFall 2004
  • 18. Choose based on your Information Need Try Noodle Tools: bbie/literacies/information/5loc ate/adviceengine.htmlCSUS LibraryInstructionFall 2004
  • 19. Search Engine Comparisons Most have built-in search tips or help screens. Boolean operators, phrase searching and other limiters are often available. Be aware! Some now charge for higher page placement e.g, Overture.CSUS LibraryInstructionFall 2004
  • 20. Handout See “Searching the Web” handout of special search features and URLs for most popular search engines. s/searchweb/srchweb-info.htmlCSUS LibraryInstructionFall 2004
  • 21. Part 3Search Tips World& Strategies Wide Web
  • 22. Reading Parts of the URL part before the colon is the accessmethod or protocol, (hypertexttransfer protocol).The part after the double slashes is thenet address or domain name of thecomputer where the resource islocated.The directory path and filenamecome after the next slash.
  • 23. Common Codes in Domain Namesedu - higher net - computereducation networkscom - commercial int - internationalfirms (+22 million) organizationsgov - government State or Country ofagencies origin:mil - military (US) – uk (Unitedorg - general Kingdom)noncommercial – ca (Canada)organizations – (California. United States)
  • 24. New Suffixes added by ICANN, effective Spring 2002 .info (anyone) .museum (accredited) .aero (Airtransport .biz (business) industry) .name .coop (business (individuals) cooperatives) .pro (Content (professionals) and technology restrictions)CSUS LibraryInstructionFall 2004
  • 25. Think critically about the information you find on the Web... Anybody can publish anything on the Web. There are no editors and no central authorities. There are no guarantees that the site you find will be there next time you look.CSUS LibraryInstructionFall 2004
  • 26. Questions you should ask when evaluating a Web page: Who is the author or sponsor? What authority/expertise do they have? What is the purpose/scope of the page? Is it current? When was it last updated? How complete and accurate is the information? Does it have a bias? How usable is it? Do the the links work?CSUS LibraryInstructionFall 2004
  • 27. You must... Examine assumptions and possible biases. Distinguish between fact and opinion. Compare and contrast related pieces of information from other sources (print and online).CSUS LibraryInstructionFall 2004
  • 28. Bogus sites proliferate POP! the First Human Male Pregnancy – Dihydrogen Monoxide Research – Clones-R-Us – LibraryInstructionFall 2004
  • 29. Sites need to be examined carefully and compared Martin Luther King Jr. – A Historical Examination – The King Center 60923/ – LibraryInstructionFall 2004
  • 30. Web Searching Tips Use unique words or phrases. Check spelling ! Use synonyms or multiple spellings (e.g., marijuana marihuana) Try more than one search engine. Use words like “research” or “policy” to find more scholarly sites. Use domain limit feature e.g., Domain:edu or domain:govCSUS LibraryInstructionFall 2004
  • 31. Citing Electronic Sources Look for it on the Library Home Page under Databases andPeriodical Indexes. Look on the leftfor Guides For General & News and click on Citing Electronic Sources. The URL is... graphy.htm.
  • 32. WARNING Con artists and scams are proliferating on the Web. Don‟t use your credit card number unless you are assured of a secure system. Don‟t download unfamiliar software. Don‟t give out personal information.CSUS LibraryInstructionFall 2004
  • 33. Browser Configuration Tips Clear the memory cache before you begin a search session. It will speed up your response time. Use the following path for I.E.: Tools -> Internet Options -> Delete Files. For Netscape use : Edit -> Preferences -> Advanced -> Cache Delete Cookies at the same screen.CSUS LibraryInstructionFall 2004
  • 34. Shortcuts Use Bookmarks or Favorites Use Go from the pull-down menus instead of the Back button or use the History or right mouse button. Use the Stop and Reload buttons if loading a document takes too long. CTRL ALT DEL will bring up Windows 2000 Task Manager and you can close the browser if it is not responding.CSUS LibraryInstructionFall 2004
  • 35. Part 4Popular WorldSearch WideEngines Web
  • 36. US Digital Media Universe Audience Reach Home & Work Users January 2003 KEY: GG=Google, YH=Yahoo, MSN=MSN, AOL=AOL, AJ=Ask Jeeves, OVR=Overture (GoTo), IS=InfoSpace, NS=Netscape, AV=AltaVista, LY=Lycos,, LS=LookSmart,CSUS LibraryInstructionFall 2004
  • 37. Billions Of Textual Documents Indexed as of Sept 2, 2003 KEY: GG=Google ATW=AllTheWeb, INK=Inktomi, AV=AltaVista, TMA=Teoma.CSUS LibraryInstructionFall 2004 Source:
  • 38. There are specialized search engines for almost every topic For a list of over 3,000 search engines go to Search Engine Guide: For detailed information aimed at search professionals try SearchEngineWatch: http://www.searchenginewatch.comCSUS LibraryInstructionFall 2004
  • 39. Most Popular Search Engines All the Web, AltaVista, Gigablast, Ask Jeeves, Dogpile, Google, HotBot, Metacrawler, LookSmart, Lycos, MSN Search, Netscape Search, Teoma, WiseNut and Yahoo! (Source: LibraryInstructionFall 2004
  • 40. Result rankings are based on the number of links made to the site from other web pages. Give you sites that web page creators have “voted” for with their links. An .edu link counts more than one from a .com page.CSUS LibraryInstructionFall 2004
  • 41. Most popular search engine & searches greatest number of pages (3.3 million) Special features include Advanced search, Image, Froogle, Blogger, Google Catalogs etc.CSUS LibraryInstructionFall 2004
  • 42. Queries one or more web search engines (Metasearch). Clusters Documents into groups based on this information. Groups the documents Orders the groups and the documents within each group. Displays the hierarchical categories.CSUS LibraryInstructionFall 2004
  • 43. Originated “Directory” format to organize sites by subject and subheadings. Can personalize: “My Yahoo”. Geographic versions “Get Local.”CSUS LibraryInstructionFall 2004
  • 44. Results – ranked list. Refine – suggestions to narrow your search. Resources – link collections from experts to enthusiasts. Watch out for “Sponsored” page results – paid listings.CSUS LibraryInstructionFall 2004
  • 45. Advanced searching in Hotbot and other search engines lets you limit by: – Language – Domain – Region – Date – Content etc.CSUS LibraryInstructionFall 2004
  • 46. Indexes 3.15 billion pages (almost as many as Google). You can customized your preferences. Language translator and language settings.CSUS LibraryInstructionFall 2004
  • 47. This PowerPoint presentation was prepared by: Linda J. Goff Head, Instructional Services University Library California State University, Sacramento. LibraryInstruction LJG:2/16/2004Fall 2004
  • 48. Search Engine Comparison Always try more than one! /features/searchen ginechart.htmCSUS LibraryInstructionFall 2004
  • 49. CSUS LibraryInstructionFall 2004