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...e and described here:[1] and more formally here: [3]. But comparing my answers to those generated by the Python implementation here [2], I obtain different answers. Unfortunately I don't know enough Python to tell where I might be going wrong. Any suggestions? [1] http://en.wikipedia.org/wiki/Slope_One#Slope_one_collaborative_filtering_for_rated_resources [2] http://www.serpentine.com/wordpress/wp-content/uploads/2006/12/slope_one.py.txt [3] http://www.daniel-lemire.com/fr/documents/publications/lemiremaclachlan_sdm05.pdf # take a 'training' set, tr.set and a vector with some missing r...