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.... It is mentioned in the paper that "the MAP improvements of BM25+ over BM25 are much larger on Web collections than on the news collection. In particular, the MAP improvements on all Web collections are statistically significant." Therefore, they seem to have used four TREC collections: WT2G, WT10G, Terabyte, and Robust04, which represent different sizes and genre of text collections. > Is this pure Dirichlet, or two-stage smoothing using Dir+ > versus Dir? What smoothing parameters were you using? That is pure Dirichlet vs Dir+ and sorry, I should have also uploaded the config...

Hi all, I have evaluated new weighting schemes along with their existing counterparts in Xapian to compare and see which one does better job. Also, I have put together all the results files for easy access here: https://github.com/ivmarkp/xapian-evaluation/tree/evaluation/run and a README for getting started with xapian-evaluation module. Hopefully, it might be of help to those who are new to

Hi, Evaluation of pivoted normalization ("PPP") of tf-idf weighting scheme is also complete now. I have also evaluated the default tf-idf normalization ("ntn") and other normalizations combinations involving pivoted normalization in wdfn, idfn and wtn component as "Pxx", "xPx" and "xxP" normalization strings respectively to have a clear idea about