Method and system for calculating term-document importance
US6473753B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1998 |
| Grant date | Oct 29, 2002 |
| Priority date | — |
| Expiry date | Dec 18, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S707/99935
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A weighting system for calculating the term-document importance for each term within each document that is part of a collection of documents (i.e., a corpus). The weighting system calculates the importance of a term within a document based on a computed normalized term frequency and a computed inverse document frequency. The computed normalized term frequency is a function, referred to as the “computed term frequency function” (“A”), of a normalized term frequency. The normalized term frequency is the term frequency, which is the number of times that the term occurs in the document, normalized by the total term frequency of the term within all documents, which is the total number of times that the term occurs in all the documents. The weighting system normalizes the term frequency by dividing the term frequency by a function, referred to as the “normalizing term frequency function” (“&Ggr;”), of the total term frequency. The computed inverse document frequency is a function, referred to as the “computed inverse document frequency function” (“B”) of the inverse document frequency. The weighting system identifies…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.