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Web Searching and PPT PowerPoint PPT Presentation


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Web Searching and PPT. Searching for Information on the Web. Goals: Decrease number of search results Increase number of relevant results Method: Structured vs keyword searching Use any of several search tips and commands

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Web Searching and PPT

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Web searching and ppt l.jpg

Web Searching and PPT


Searching for information on the web l.jpg

Searching for Information on the Web

  • Goals:

    • Decrease number of search results

    • Increase number of relevant results

  • Method:

    Structured vs keyword searching

    • Use any of several search tips and commands

    • Search engines vary in terms of the commands they support. Just because one does not find it does not mean its not there.


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Different search engines are different. All have “help”

  • http://www.google.com/intl/en/help/basics.html

  • http://search.yahoo.com/web/advanced

  • http://help.ask.com/en/docs/about/adv_search_tips.shtml

  • http://www.dogpile.com/info.dogpl/search/help/faq.htm?r_fcid=416&r_fcp=top


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Search Command Options

  • “Search engine math”

    • Basic tips to improve your search

  • Field searching

    • Search for terms within specific parts of the document (e.g., title)

  • Boolean and other advanced commands (e.g., AND, OR)

  • Search assistance and display features

    • Features of the engines, themselves


Search engine math l.jpg

Search Engine Math

  • Include term (+)

    • To ensure word is included in search

      e.g., +camping +Arkansas

  • Exclude term (-)

    • find pages that have one word on them, but not another word

      e.g., +apples -computer

  • Phrase (“_”)

    e.g., “social psychology”


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Search Engine Math II

  • Match any term

    • Automatic in some, option on others

    • Match all terms

    • Use + or menu; automatic at some (google)

  • Truncation/Wildcard (*)

    • To find all forms of a word

    • archaeolog* (-y, -ical, -ist)

    • Stemming: finds all forms based on the stem automatically

    • Automatic at google


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Field Searching and Limiting

  • Title search -- to search for words w/in titles of web pages

    e.g., +title:elephant +species

  • Site search -- to search w/in documents on a specific site

    e.g., domain:memphis.edu psychology

  • URL search -- to search within the text of URLs

    e.g., url:memphis.edu


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Field Searching and Limiting II

  • Link search -- to search for pages that link to a particular page or domain

    e.g., link:psyc.memphis.edu/students/../

  • Limit by language

    • Search for documents in a particular language

  • Limit by date pages were created or modified

  • Limit by type

    • Engineering filetype:ppt


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Boolean Commands

  • AND returns pages containing all search terms joined by AND

    e.g., Mars AND planet AND life

  • OR returns pages containing any or all search terms joined by OR

    e.g., “bed and breakfast” or inn

  • NOT returns pages containing the first but not the second term

    e.g., clinton NOT lewinsky


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Boolean Commands II

  • NEAR returns pages containing keywords near each other on the page

    e.g., psychology NEAR history

    (distance can be specified . Alta Vista does this)

  • Nesting Boolean commands provides for complex queries

    e.g., psychology AND (social OR cognitive) . . . If no parentheses . . .

    (psychology AND social) OR cognitive


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Combining Commands

  • Examples:

    • (cat* OR feline*) AND “endangered species”

    • +title:psychology +dream* -Freud*

    • “star trek” -voyager -“deep space nine” -“next generation”

  • Works only if search engine supports each command, obviously


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Search Assistance Features

  • Related Searches

    • Search engine provides related searches after a search is complete

  • Find Similar

    • Provides ability to find other pages that seem similar to those you like

  • Search Within

    • Do a second search within results already generated


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Display Features

  • Ability to sort results by date (created or modified), with most recent documents listed first

  • Some search engines display the date page was created or modified

    * Note: dates can be unreliable (gotten from server)

  • Ability to increase the number of results that are displayed

  • Google use a patented algorithm for “search order” display.


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A Note about Meta-search Engines

  • Dogpile and MetaCrawler will allow many of these commands, but if the engine they are polling does not, you may end up with funky results

  • Sometimes, the syntax will be removed (e.g., Boolean operators)

  • At other times, however, they will become a keyword in the search (e.g., title:)


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Specialty Search Engines

  • Catalog information particular to a narrow topic area

  • Pro: potentially more coverage versus the general search services

  • Con: don’t provide you the search options and flexibility of general search engines

  • A directory of search engines (general and specialty):

    www.beaucoup.com


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Example

  • Compound interest quote


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Checking things.

  • Not everything on the web is “correct”

  • Not everything in print is “correct”.

  • Often have to “check your facts…”

  • http://timpanogos.wordpress.com/2006/07/22/einstein-compound-interest-does-not-compute/


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Sources

  • Understand the “trustworthiness” of the source.

  • Credible publishers (webster) Probably okay

  • Wikipedia reasonable but less reliable (many can fix, but still many add/change).

  • Blogs: often dubious

  • Ask why its there, what is their interest.


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