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==History==
This is an example of a [[latent class model]] (see references therein), and it is related <ref>Chris Ding, Tao Li, Wei Peng (2006). "[http://www.aaai.org/Papers/AAAI/2006/AAAI06-055.pdf Nonnegative Matrix Factorization and Probabilistic Latent Semantic Indexing: Equivalence Chi-Square Statistic, and a Hybrid Method. AAAI 2006" ]</ref><ref>Chris Ding, Tao Li, Wei Peng (2008). "[http://www.sciencedirect.com/science/article/pii/S0167947308000145 On the equivalence between Non-negative Matrix Factorization and Probabilistic Latent Semantic Indexing"]</ref> to [[non-negative matrix factorization]]. The present terminology was coined in 1999 by [[Thomas Hofmann]].<ref>Thomas Hofmann, [http://www.cs.brown.edu/~th/papers/Hofmann-SIGIR99.pdf ''Probabilistic Latent Semantic Indexing''], Proceedings of the Twenty-Second Annual International [[Special Interest Group on Information Retrieval|SIGIR]] Conference on Research and Development in [[Information Retrieval]] (SIGIR-99), 1999</ref>
== References and notes ==
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