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Methods for document indexing and analysis

  • US 7,130,848 B2
  • Filed: 08/07/2001
  • Issued: 10/31/2006
  • Est. Priority Date: 08/09/2000
  • Status: Expired due to Fees
First Claim
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1. A method for analysis of a collection of documents which comprises the steps of:

  • a) selecting a set of documents for analysis;

    b) preparing for electronic analysis of the documents by incorporating selected document sections into a database compatible format;

    c) selecting at least one document section;

    d) forming a list of analysis key words from one or more document sections into an initial word list;

    e) removing duplicate or nonessential words;

    f) standardizing word forms of the initial word list to a common form;

    g) setting a word list threshold;

    h) removing word forms from the initial word list that are present with a frequency less than the word list threshold;

    i) sorting the resulting word list by frequencyj) forming a first word correlation matrix using the initial word list;

    k) counting the frequency with which a word pair is found in a collection of selected documents;

    l) setting a first frequency count threshold;

    m) forming a first technology topics collection by selecting word pairs with frequency counts above the first frequency count threshold for each column in the first word correlation matrix;

    n) forming an additional word correlation matrix from the words in the collection of the first technology topics;

    o) forming an additional technology topics collection by associating word pairs from one or more first technology topics;

    p) optionally repeating steps n and o;

    q) counting, for each technology topic, the number of words appearing in each document of the document collection and optionally applying a weighting factor;

    r) assigning each document in the collection to an additional technology topic; and

    s) forming a standard picture of technology evolution by plotting individual documents on a graph with selected technology topics along one axis and a date along another axis.

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