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From Nicolas Maisonneuve <>
Subject problem for the adataption of a xml ranking model
Date Thu, 10 Mar 2005 14:25:22 GMT

I'm trying to adapte a xml ranking model for lucene. 

For the moment i'm just playing with the leaf node i.e. a node
containing data. For lucene, this node is a a search field and the idf
is replaced by ief (inversed element frequency)
ief= log (NumDoc_e)/(NumDoc_e_t+1) +1

NumDoc_e_t = number of doc with element e containing the term t.
NumDoc_e_t=docFreq(new Term(e, t))

NumDoc_e = number of documents with the element  el ( = number of
documents with some values in the search field el )

How do you compute the numDoc_e with the lucene API ?.


nicolas maisonneuve

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