06006218 is referenced by 254 patents.

Information retrieval methods and apparatus which involve: 1) the generation of estimates regarding the probability that items included in search results are already known to the user and 2) the use of such knowledge probability estimates to influence the ranking of search results, are described. By discounting the ranking, or adjusting ranking values generated by a known search engine as a function of the knowledge probability estimates, the present invention reduces or eliminates the risk of locating known information near the top of a list of search results. This is advantageous since known information is generally of little interest to a user. In various embodiments the popularity of an item is used to estimate the probability that the item is already known to a user. In addition, in various embodiments one or more user controllable parameters are used in the generation of the knowledge probability estimates and/or the ranking of the search results to give the user an opportunity to have the ranking of the search results accurately reflect the user's knowledge. The present invention is particularly well suited to collaborative filtering based search systems. This is because collaborative filters make recommendations to a user based on historical information relating to, e.g., the popularity of items being considered for recommendation. This same popularity information can be used to estimate a users knowledge of a database item. Such items may include television shows, music, Internet sites, etc.

Title
Methods and apparatus for retrieving and/or processing retrieved information as a function of a users estimated knowledge
Application Number
8/807566
Publication Number
6006218
Application Date
February 28, 1997
Publication Date
December 21, 1999
Inventor
Keiji Kanazawa
Seattle
WA, US
Carl Kadie
Bellevue
WA, US
Eric Horvitz
Kirkland
WA, US
David E Heckerman
Bellevue
WA, US
John S Breese
Mercer Island
WA, US
Agent
Michaelson & Wallace
Agent
Michael P Straub
Peter L Michaelson
Assignee
Microsoft
WA, US
IPC
G06F 17/30
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