Web Search Tools - PowerPoint PPT Presentation

1 / 9
About This Presentation
Title:

Web Search Tools

Description:

Can use various search techniques to focus results. Not a 'live' search ... Not a 'live' search. Major advantage: saves time and keystrokes ... – PowerPoint PPT presentation

Number of Views:93
Avg rating:3.0/5.0
Slides: 10
Provided by: sharo8
Category:
Tags: live | search | tools | web

less

Transcript and Presenter's Notes

Title: Web Search Tools


1
Web Search Tools
  • How to get the most out of search engines, web
    directories, and meta-searchers

2
The Web is great for locating
  • Current information
  • Background information related to current events
  • Live, as-it-happens information (e.g., breaking
    news stories)
  • Customizable information (e.g., Yahoo add-ons)
  • Specific facts
  • Information buried within documents that you
    cant locate using an online catalog, printed or
    CD-ROM indexes, or tables of contents
  • Multimedia resources pictures, sound clips,
    maps, etc.
  • Government information
  • Timely information stock quotes, real estate and
    job listings
  • Information that you can subsequently keyword
    search using a search engine

3
but it has only modest amounts of
  • Books
  • Archival materials (manuscripts, census data,
    historical documents, etc.)
  • Scholarly criticism of literature, art, music,
    etc.
  • Retrospective databases
  • Citations or full-text for articles in older
    periodicals

The web is also not a reliable medium for
long-term storage and retrieval of information.
4
The Invisible Web
  • Sometimes called the Deep Web
  • Information that search engines cannot or refuse
    to index because it is locked up within databases
  • At least 500 times bigger than the part of the
    web visible to search engines
  • Want to know more? Go to www.brightplanet.com
  • The bottom line DONT RELY ON GENERAL WEB SEARCH
    TOOLS FOR ALL YOUR INFORMATION NEEDS!

5
Web Indexes, Directories Review Sites
  • Built by humans
  • Selective
  • Evaluated
  • Organized according to a scheme
  • Most like a Subject search on ALICE
  • Based on a thesaurus (pre-defined list of terms)
  • Includes see see also references
  • Two types of searching browse and keyword
  • Can use various search techniques to focus
    results
  • Not a live search
  • Major advantage user-friendly can be easily
    browsed
  • Major disadvantage limited number of sites
    indexed

Cannot find information located inside other
databases, e.g., ALICE or Academic Search Premier.
6
(No Transcript)
7
Web Search Engines
  • Built by robot programs, not humans
  • Not selective
  • Not evaluated
  • Results arranged but not organized
  • Most like a keyword search on ALICE
  • No thesaurus
  • No cross-references
  • Keyword searching only
  • Must use keyword search techniques to focus
    results
  • Not a live search
  • Major advantage can locate information buried
    inside web pages
  • Major disadvantage can bring back too many
    results

Cannot find information located inside other
databases, e.g., ALICE, Periodical Abstracts, etc.
8
(No Transcript)
9
? Dogs 2 Documents ? Cats 2 Documents
10
? Dogs OR Cats 3 Documents ? Dogs AND Cats 1
Document ? Dogs NOT Cats 1 Document
11
Search Tools Arent Perfect
Search Tool of Web Indexed Outdated
Links
AltaVista 28
2.5
Excite 14
2.0
HotBot 34
5.3
Infoseek 10
2.5
Lycos 3
1.5
Northern Light 20
5.0
Based on a study done in December 1997 and
published in the April 3, 1998 issue of Science.
12
and Theyre Losing Ground!
Search Tool of Web Indexed of Web
Indexed Dec. 1997
Feb. 1999
AltaVista Excite HotBot Infoseek Lycos Northern
Light Snap Google Yahoo
28.0 14.0 34.0 10.0 3.0 20.0
15.5 5.6 11.3 8.0 2.5 16.0 15.5 7.8 7.4
Based on a study done in December 1997 and
published in the April 3, 1998 issue of Science,
and a follow-up study done in February 1999 and
published in the July 8, 1999 issue of Nature.
13
Search Engine Reliability
Searches done May 3, 1999 on AltaVista
  • Search Terms
  • mars
  • mars jupiter
  • mars jupiter mercury
  • mars jupiter mercury pluto
  • mars jupiter mercury pluto mickey
  • Number of Hits
  • 1,844,953
  • 615,650
  • 635,900
  • 423,990
  • 1,103,810

What is the default, AND or OR?
14
Search Engine Reliability (cont.)
  • The last search had, as its 5 result, a page
    titled Terry Pluto on Mickey Mantle and Jerry
    Garcia. None of the other planets showed up
    anywhere in the document.
  • 8 of the other top 10 were about Disney
    characters, and the only one about planets was
    titled Tiny Pluto No Mickey Mouse Planet.

(from a librarian at Wesleyan U.)
15
Meta-Search Tools
  • Results gathered by sophisticated search programs
  • Not selective
  • Not evaluated
  • Results arranged but not organized
  • Most like an automated reference librarian
  • No thesaurus
  • No cross-references
  • Keyword searching only search once multiple
    results (in simultaneous meta-searchers)
  • Can use limited keyword search techniques
  • Not a live search
  • Major advantage saves time and keystrokes
  • Major disadvantage cant customize each search

Cannot find information located inside other
databases, e.g., ALICE, Periodical Abstracts,
etc.
16
(No Transcript)
17
Evaluating Websites
  • Accuracy
  • Authority
  • Coverage
  • Currency
  • Objectivity

18
Citing Websites
  • More than one correct way
  • APA, MLA, etc.
  • See http//www.library.ohiou.edu/libinfo/howto/cit
    ing.htm
  • Example (MLA)
  • William Faulkner on the Web. 7 July 1999. NU of
    Mississippi. 20 Sept. 1999. http//www.mcsr.olemis
    s.edu/egjbp/faulkner/
  • faulkner.html.

19
Points to remember
  • Its not all on the web!
  • Remember the Invisible Web
  • Directories vs. Search Engines
  • Use Advanced Search features
  • No search engine is perfect
  • Evaluate, Evaluate, Evaluate!
Write a Comment
User Comments (0)
About PowerShow.com