Constant Ranking Function

A Constant Ranking Function is a Ranking Function that assigns a Constant Value to all Members.

• See: Term Frequency Ranking Function, TF-IDF Ranking Function.

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References

2009

• (Wikipedia, 2009) ⇒ http://en.wikipedia.org/wiki/TF-IDF
  • … Variations of the tf–idf weighting scheme are often used by search engines as a central tool in scoring and ranking a document's relevance given a user query. One of the simplest ranking functions is computed by summing the tf-idf for each query term; many more sophisticated ranking functions are variants of this simple model.
• http://en.wikipedia.org/wiki/Ranking_function
  • Some very simple ranking functions include:
    • The constant ranking function assigning the same score to all documents.
    • The term frequency ranking function counting the number of times that each query term occurs in the document, then summing these.
    • The tf-idf ranking function computing the product of the term frequency and inverse document frequency for each query term, then multiplying these.

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