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Basics. Computer Internet Search Strategy. Computer Basics. IP address: Internet Protocol Address An identifier for a computer or device on a network The format of an IP address is four numbers separated by periods. Each number can be zero to 255. For example, 134.140.112.9

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basics

Basics

Computer

Internet

Search

Strategy

computer basics
Computer Basics
  • IP address: Internet Protocol Address
  • An identifier for a computer or device on a network
  • The format of an IP address is four numbers separated by periods. Each number can be zero to 255. For example, 134.140.112.9
  • Can be static or on the fly
internet basics
Internet Basics
  • The Internet vs. The World Wide Web
  • The Internet is not synonymous with World Wide Web
internet basics1
Internet Basics
  • The Internet is a network of computer networks
  • Computers connected so they can communicate with any other computer also connected, or networked, to the internet
  • Used for communicating many kinds of information using protocols including SMTP for email and HTTP for web pages
  • The World Wide Web is only one part of the Internet, which also includes email, newsgroups, and instant messaging
internet basics2
Internet Basics
  • The World Wide Web is a “web” of documents, called web pages, connected via hyperlinks
  • One way of communicating on the internet
  • Uses HTTP protocol
  • Accessed via browsers, such as Internet Explorer or Netscape
  • Web pages can include graphics, audio, text, and video.
internet basics3
Internet Basics
  • Web pages vs. websites
  • A web page is a document on the World Wide Web
  • A website is a collection of web pages including a home page, the main page on the site and first to be viewed, plus additional, related, hyperlinked pages
internet basics4
Internet Basics
  • URL: Uniform Resource Locator
  • The unique address of a web page
  • Can be persistent or dynamic
  • Format: http://web.simmons.edu/~krajewsk
internet basics5
Internet Basics
  • A hyperlink is an element in an web page that links to another place in the same page or to an entirely different web page
  • Click on the hyperlink to access the linked web page
internet basics6
Internet Basics
  • A domain is a group of computers sharing a part of an IP address
  • Consist of a range of IP addresses
  • Will share the same basis of url
  • www.simmons.edu/libraries and www.simmons.edu/gslis are all part of the simmons.edu domain
cache
Cache
  • Copies of frequently used data stored on a local hard drive
  • Allows information to be accessed more quickly because it does not have to be retrieved from the internet each time it is called
browser
Browser
  • A Web browser isa software application used to locate and display Web pages.
  • Mostbrowserscan display text, graphics, audio, and video
internet basics7
Internet Basics
  • On the web vs. Access via the web
  • On the web: online, free, available to everyone
  • Via the web: online, but in a special, restricted database, requiring a login and /or subscription fee
internet basics8
Internet Basics
  • A search engine is a program that searches the web for specified keywords and returns a list of the web pages where the keywords were found
search basics
Search Basics
  • Searching is the process of querying a database—a library catalog, periodical index, or search engine—to find relevant information
search basics1
Search Basics
  • Each item in a database is called a RECORD
  • All records are INDEXED by specialists or computers who pull out key pieces of information
  • Each key piece of information indexed belongs in a specific FIELD, which is generally searchable (author, title, or specific to subject)
  • HITS are the number of records in the entire database that match your search terms
search basics2
Search Basics
  • Syntax – The “language” of the database you are searching
  • HOW you translate you information need into a query
search basics3
Search Basics

Boolean operators are connectors used to define the relationship between or among your search terms:

  • OR – EitherTerm AorTerm B must be present on a web page for it to be included in your results list
  • AND – BothTerm AandTerm B must be present for the web page to appear on the results list
  • NOT – Term Amust be present and Term Bmust not be present for the web page to appear on the results list
slide18

Dogs OR Cats

  • Gets both, might be overlap

Dogs

Cats

slide19

Dogs AND Cats

  • Only gets records where both appear

Dogs

Cats

slide20

Dogs NOT Cats

  • Eliminates Records where Cats Appear

Dogs

Cats

slide21

Parentheses: Nesting

(Dog? or Pupp?) and (Cat? or Kitten?)

Dog or Dogs or

Puppy or

Puppies

Cat or Cats

or Kitten or

Kittens

search basics4
Search Basics

Proximity operators specify how close search terms must appear together in a web page to be included in the results list:

  • Next to – Term A and Term B must appear right next to each other for the web page to appear in the results list
  • Near – Term A and Term B must be near each other for the web page to appear in the results list
  • Within # - Term A and Term B must appear within a certain number of words for the web page to appear in the results list
  • Same paragraph - Term A and Term B must appear in the same paragraph for the web page to appear in the results list
search basics5
Search Basics
  • Truncation is the use of a symbol to stand for any possible ending of a root
  • Eliminates the need for long searches with similar words separated by the Boolean operator OR
  • Example Child* The asterisk * can stand for any possible ending of the root child, such as child, children, childhood, child’s, children’s,
search basics6
Search Basics
  • Wildcard symbols can stand for any character or characters within a word
  • Useful for roots that have many unrelated endings
  • Example wom?n can stand for woman, women, womon, womyn
search basics7
Search Basics
  • Searching terms as a phrase dictates that they appear in the order specified, right next to each other, in the web page
  • Sometimes automatic
  • Useful in searching for short quotations
  • Example “hot cross bun” finds only web pages with that exact phrase, eliminating those that have the words hot, cross, and bun unrelated to one another
search basics8
Search Basics
  • Limits restrict what part of the web page is searched
  • Limited limiting capabilities with search engines
  • Usually searches metadata, information that cannot be seen on the web page, itself
  • Example Language:English finds only web pages with English language text
search basics9
Search Basics

Search Index syntax varies

  • Usually no field searching
  • Limited truncation and wildcards
  • Boolean “AND” may be assumed
  • Phrase syntax important
  • Limit search effectiveness dependent on web page creators’ included metadata
search basics10
Search Basics
  • Natural language searching common with search engines
  • No connectors (no boolean, proximity, etc.)
  • Statistical algorithm for “relevance”
    • Term frequency
    • Term location
    • Proximity of terms to each other
    • Uniqueness of term
    • Possibly “popularity” of document
    • Build taxonomy “on the fly”
search strategies
Search Strategies

Key Factors for Successful Web Searching :

  • Which search engines/resources you choose for the search
  • How carefully you formulate & execute the search terms & search logic
  • How much information is actually available
search strategies1
Search Strategies
  • Precision & Recall are traditional measures of a successful search
  • Recall: % of relevant records found of all the relevant records (possible hits) in file
    • “How much of the good stuff did your search produce?”
    • measured against all the possible relevant hits
  • Precision: % of relevant records within search results
    • “How much of the bad stuff did your search produce?”
    • measured against what you actually retrieved
search strategies2
Search Strategies

Precision vs. Recall

Usually inverse relationship

High

Recall

Low

Precision

Low

High

search strategies3
Search Strategies
  • Precision is assured by choosing enough appropriate concepts
  • Recall is assured by choosing enough appropriate synonyms
search strategies4
Search Strategies

Choosing Search Words

  • Make a list of concrete words that define the topic
  • Identify alternatives
search strategies5
Search Strategies

Simplify words:

  • Plurals: s, es, y-ies often will automatically be searched
  • Truncate (often * or !): packag* or wrap*
search strategies6
Search Strategies

Eliminate general and assumed/applied terms

  • Leave out “science” if you are search a science search engine
  • Consider whether or not to search “efforts” - general term implied in most articles – an web page discussing effort to do something is likely not to include the word “efforts”
search strategies7
Search Strategies

Be the most specific (narrowest) when:

  • Sure of target document(s)
  • Don’t care about recall (precision first)
  • Don’t have time to plan
  • “Quick & Dirty”
search strategies8
Search Strategies

To narrow a search

  • “And” in a new concept
  • Use fewer terms in concept sets
  • Be more specific - use proximity over ands
  • Go from free text to controlled vocabulary/fields
  • Truncate further right
  • Use narrower, more specific vocabulary terms
  • Qualify search strategies to titles, abstracts, descriptors
  • Limit by language, publication year, type
search strategies9
Search Strategies

Be less specific (broadest) when:

  • Need comprehensive retrieval (high recall)
  • “Feeling your way”
    • Unsure of terms
    • Unsure of database content
    • Fuzzy topic
search strategies10
Search Strategies

To broaden a search:

  • Eliminate a concept set - the least crucial
  • OR in more terms
  • Be less specific - go from descriptors to free text
  • Use broader ands instead of proximity
  • Truncate further left
  • Use broader controlled vocabulary terms
  • Remove qualifiers; search full text
  • Remove limitations
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