Search Yahoo! With Boolean Operators AND, OR, (), “”, NOT, Domain:

Search Engine Coverage Comparison - I  Common Search Engines – Misconceptions Search Engines index all available content on the web They all work in roughly the same way and they all deliver similar results  If this is true – what is the likelihood that a site will show up on the first page (top 10) of results of all 4 major search providers?

Search Engine Coverage Comparison - 2  1.1 %  The study looked at search results from 12,570 random queries on Ask, Google, MSN search and Yahoo which suggests that each of the four major search engines has a unique ranking approach of findings not duplicated by the other search engines. Info from “A study of Results Overlap and Uniqueness Among Major Web Search Engines” by Spink, Jansen, Blakely, and Koshman published in Information jProcessing and Management (2006)A study of Results Overlap and Uniqueness Among Major Web Search Engines

Search Engine Coverage Comparison - 3   Searched “Virtual Reality” in Google vs. Yahoo.  Results Results Dots=web sites Blue Dots=web sites both engines have in common

Search Engine Features Chart  om/features/ om/features/  Search engines provide different search techniques, different limits, and etc.

Why Boolean Operators?  Limitations of natural language process (NLP), i.e, “who is John Kerry” does not always work

AND & “” (quotations)  Virtual Reality Medical Training -> Virtual Reality Medical Training Without any Boolean operator = 6,200,00 hits  "Virtual Reality" AND " Medical Training " -> 70,300 hits "Virtual Reality" AND " Medical Training "

OR, “”, (), adding more keywords  ("Virtual Reality" OR Simulation) AND “Medical Training” -> 268,000 hits—this number is larger again because we added a synonym ("Virtual Reality" OR Simulation) AND “Medical Training”  NOTE: no need to enclose a single word with quotation mark (“ ”)  ("Virtual Reality" OR Simulation) AND (Medical OR Surgical) AND Training ("Virtual Reality" OR Simulation) AND (Medical OR Surgical) AND Training -> 1,210,000 hits—this number grew because we added another synonym

More Keywords  Combining keywords with special keywords above  ("Virtual Reality" OR Simulation) AND “Medical Training” AND (benefits OR advantages) -> 73,500 hits ("Virtual Reality" OR Simulation) AND “Medical Training” AND (benefits OR advantages) applicationcase studiesexamplesimplementation reviewsanalysismodelsillustrations benefitsadvantagesdisadvantagesliabilities

Domain:  ("Virtual Reality" OR Simulation) AND “Medical Training” AND (benefits OR advantages) AND domain:com -> 18,500 hits ("Virtual Reality" OR Simulation) AND “Medical Training” AND (benefits OR advantages) AND domain:com  ("Virtual Reality" OR Simulation) AND “Medical Training” AND (benefits OR advantages) AND domain:org -> 11,300 hits ("Virtual Reality" OR Simulation) AND “Medical Training” AND (benefits OR advantages) AND domain:org (other domains,.com,.org,.gov, and.edu)