Lect13WebDataValidation - Announcements Check announcements...

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Announcements Check announcements daily 1
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2 Web Search Tools Subject (Web) Directories Search Engines Based on “spider” gathering information Search Engine List http://websearch.about.com/od/enginesanddirectories/tp/search- engine-list.htm MetaSearch Engines Rely on several search engines to get results. MetaSearch Engine List http://websearch.about.com/od/metasearchengines/Meta_Search_ EnginesSearch_with_the_Best_Meta_Search_Engines.htm Invisible Web Example – searchable databases Great References http://websearch.about.com/od/internetresearch/a/whatissearch.htm http://www.lib.berkeley.edu/TeachingLib/Guides/Internet/FindInfo.html
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3 Web Directories Organizes web sites by topic It is maintained by humans rather than software Smaller than search engines’ databases How to search a web directory A provided term is search in the directory’s indexed categories Examples Open Directory - http://www.dmoz.org/ Yahoo - http://dir.yahoo.com/ Mahalo - http://www.mahalo.com/
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Trustworthiness of Web Data How can we verify the data/information from the web is valid? Cartoon – “On the Internet, Nobody Knows You’re a Dog” How can we verify the data validity and integrity? Remember anyone can write a web page! Example: Wikipedia – who writes it? How can we know a web site is legit? You need to carefully evaluate what you find in the web
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Lect13WebDataValidation - Announcements Check announcements...

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