While using the pruning package, I realised that ridf is calculated in RIDFTermPruningPolicy as follows: Math.log(1 - Math.pow(Math.E, termPositions.freq() / maxDoc)) - df
However, according to the original paper (Blanco et al.) for residual idf, it should be -log(df/D) + log (1 - e^(*-*tf/D)). Thus, in the equation, Math.pow should be Math.pow(Math.E, - (termPositions.freq() / maxDoc)) Do I miss something in the calculation or is this a bug? Thanks in advance ZP -- View this message in context: http://lucene.472066.n3.nabble.com/delete-entries-from-posting-list-Lucene-4-0-tp3838649p3862334.html Sent from the Lucene - Java Users mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
