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How Google Works
How Google Works
What happens when you Google
What happens when you Google
Google Search Results
Google Search Results
Google Cache
Google Cache
Google Cached
Google Cached
Boolean Searching
Boolean Searching
Default AND between terms
Default AND between terms
Stemming
Stemming
What Google doesn’t search (unless you ask nicely)
What Google doesn’t search (unless you ask nicely)
What Google doesn’t search (unless you ask nicely)
What Google doesn’t search (unless you ask nicely)
Google Search Results
Google Search Results
PageRank
PageRank
But how do I make my searches better
But how do I make my searches better
Improving Google’s AND
Improving Google’s AND
Improving Google’s AND
Improving Google’s AND
Boolean Searching
Boolean Searching
Search Operators
Search Operators
Search Operators
Search Operators
Limitless Options for Limits
Limitless Options for Limits
Using URL’s
Using URL’s
Finding that file
Finding that file
More about Google
More about Google

Презентация на тему: «How Google Works». Автор: lholmber. Файл: «How Google Works.ppt». Размер zip-архива: 390 КБ.

How Google Works

содержание презентации «How Google Works.ppt»
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1 How Google Works

How Google Works

Lisa Holmberg Bibliographical Center for Research lholmber@bcr.org

2 What happens when you Google

What happens when you Google

3 Google Search Results

Google Search Results

Ads selected by Google based on you search terms

Search terms are in bold

Database Google Used

Approximate # of hits

URL, size, date last crawled Cached link Pages like this one

4 Google Cache

Google Cache

5 Google Cached

Google Cached

Cached reveals the page as Google found it may differ from the current page Cached exists if a page is full-text indexed About 1 billion pages in Google are not cached Not fully searchable no Cached if a page owner requests not to be cached

6 Boolean Searching

Boolean Searching

And

7 Default AND between terms

Default AND between terms

The Fuzzy And only some of the words if a page is “important” words may occur only in link to the page words occur somewhere on the site a page belongs to

8 Stemming

Stemming

Google stems “when appropriate” Includes plural, singular, past, present tense of words in search Search: school librarian Result: library, librarian, library’s, librarian’s Single word searches aren’t stemmed

9 What Google doesn’t search (unless you ask nicely)

What Google doesn’t search (unless you ask nicely)

Common or Stop words are ignored No official list from Google Auto-phrasing Searches containing only stop words

10 What Google doesn’t search (unless you ask nicely)

What Google doesn’t search (unless you ask nicely)

11 Google Search Results

Google Search Results

More than 100 factors in the metrics On-the-page metrics Word order matters Word frequency Automatic-phrasing In the title In unique fonts In prominent areas (like lists)

12 PageRank

PageRank

Off-the-page metrics Words describing the link Links on one site to another are like votes-- PageRank Stuffing the ballot box Reputation of the ‘voting’ page Can’t buy a better PageRank PageRank independent of search terms

13 But how do I make my searches better

But how do I make my searches better

14 Improving Google’s AND

Improving Google’s AND

+ Inclusion operator Force searches on stop words Turns off stemming Use quotation marks for phrases “public librarian” 234,000 .4% of public librarian 58,600,000 Forces searches on stop words Turns off stemming

15 Improving Google’s AND

Improving Google’s AND

Hyphen makes phrases and searches with and without hyphens bite-sized retrieves: bite-sized, bite sized, bitesized Other examples?

16 Boolean Searching

Boolean Searching

Or Not

17 Search Operators

Search Operators

OR search Search for two terms at once - exclusion operator Use with care; Search: twins Minnesota 2,750,000 Eliminate undesired words twins Minnesota –sports 1,300,000

18 Search Operators

Search Operators

* full-word wild card, word substitution Ideal for partly remembered quotes Searching for answers to questions Proximity searches ~ synonym operator ~guide searches for: tutorial, manual, help, map, tips

19 Limitless Options for Limits

Limitless Options for Limits

Intitle: terms are searched for in title only Pages concentrate on term Hybrid cars intitle:mileage Combine with OR intitle:"new urbanism" OR intitle:"sustainable communities” allintitle: Combine with site: allintitle: hybrid cars mileage –site:.com

20 Using URL’s

Using URL’s

Limit to a domain (edu, com, etc) site:edu OR site:gov OR site:lib.co.us Search within a site site:memory.loc.gov “dust bowl” Use Google as a search engine for a site Can ONLY use first part of URL Omit http: & final / inurl:dustbowl searches for term anywhere in URL

21 Finding that file

Finding that file

Filetype: Search for a particular type of document tax return filetype:pdf Exclude a filetype -filetype:xls Can use view as HTML Avoid viruses Allows you to read it even if you don’t have the software

22 More about Google

More about Google

Google Guide http://www.googleguide.com/ Google Librarian Center http://www.google.com/librariancenter/index.html

«How Google Works»
http://900igr.net/prezentacija/ekonomika/how-google-works-96805.html
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