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Automatic Thesaurus Generation

  • Discussion

  • Quality of associations is usually a problem.

  • Term ambiguity may introduce irrelevant statistically correlated terms.

    • “Apple computer”  “Apple red fruit computer”

  • Problems:

    • False positives: Words deemed similar that are not

    • False negatives: Words deemed dissimilar that are similar

  • Since terms are highly correlated anyway, expansion may not retrieve many additional documents.

Speaker notes:

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