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From Antonio Gulli <>
Subject Re: Contribution: better multi-field searching
Date Fri, 22 Oct 2004 16:58:37 GMT

> If someone can demonstrate that an alternate formulation produces 
> superior results for most applications, then we should of course 
> change the default implementation.  But just noting that there's a 
> factor which is equal to idf^2 in each element of the sum does not do 
> this.

Dont think that there is a magic formula, but found these papers 

Title: Understanding inverse document frequency: on theoretical arguments
for IDF
Author: Stephen Robertson
Pages: 503-520

Title: IDF term weighting and IR research lessons
Author: Karen Spärck Jones
Pages: 521-523

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