BibSonomy publications for /user/wnpxrz/lsiWed Nov 07 16:31:14 CET 2007159--168Latent Semantic Indexing: {A} Probabilistic Analysis1998imported lsi probabilistic lsa Thu Jun 28 14:04:11 CEST 2007ACM Transactions on Information Systems (TOIS)189--115Latent semantic models for collaborative filtering222004collaborative latent semantic modeling filtering lsi Collaborative filtering aims at learning predictive models of user preferences, interests or behavior from community data, that is, a database of available user preferences. In this article, we describe a new family of model-based algorithms designed for this task. These algorithms rely on a statistical modelling technique that introduces latent class variables in a mixture model setting to discover user communities and prototypical interest profiles. We investigate several variations to deal with discrete and continuous response variables as well as with different objective functions. The main advantages of this technique over standard memory-based methods are higher accuracy, constant time prediction, and an explicit and compact model representation. The latter can also be used to mine for user communitites. The experimental evaluation shows that substantial improvements in accucracy over existing methods and published results can be obtained.