Key word extraction from a document using word co-occurrence statistical information

Yutaka Matsuo*, Mitsuru Ishizuka

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


We present a new keyword extraction algorithm that applies to a single document without using a large corpus. Frequent terms are extracted first, then a set of co-occurrence between each term and the frequent terms, i.e., occurrences in the same sentences, is generated. The distribution of co-occurrence shows the importance of a term in the document as follows. If the probability distribution of co-occurrence between term a and the frequent terms is biased to a particular subset of the frequent terms, then term a is likely to be a keyword. The degree of the biases of the distribution is measured by Χ 2-measure. We show our algorithm performs well for indexing technical papers.

Original languageEnglish
Pages (from-to)217-223
Number of pages7
JournalTransactions of the Japanese Society for Artificial Intelligence
Issue number3
Publication statusPublished - 2002
Externally publishedYes


  • Χ test
  • Keyword extraction
  • Word co-occurrence

ASJC Scopus subject areas

  • Artificial Intelligence


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