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Event detection

  • US 8,463,789 B1
  • Filed: 08/27/2010
  • Issued: 06/11/2013
  • Est. Priority Date: 03/23/2010
  • Status: Active Grant
First Claim
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1. A machine readable medium storing a program which when executed by at least one processing unit of a research system identifies an event for a category, the program comprising sets of instructions for:

  • for each of a plurality of different pre-identified categories for which the research system stores retrievable data, classifying a first set of documents from a current time period and a second set of documents from a background time period as relevant to the category, wherein the current time period and the background time period are separated by a buffer time period in order to isolate the current time period from the background time period;

    for each of the plurality of categories, calculating a score for the category for the current time period that quantifies a relative difference in a size of the first set of documents from the current time period and a size of the second set of documents from the background time period;

    when the calculated score for a particular category is above a threshold, determining the occurrence of an event for the category in the current time period; and

    storing data in the research system indicating the occurrence of an event for each of the plurality of categories for which the calculated score is above the threshold.

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