Among model-based techniques, Bayesian network is able to integrate domain knowledge with data through Bayesian statistical methods. If Bayesian network is used in creating purchasing model of customers, the relationships between customers and products being bought could be derived. Nonetheless, learning an optimal Bayesian network structure from existing data has been proven to be an NP-hard problem (Chickering, D., Geiger, D. and Heckerman, D., 1994, “Learning bayesian networks is NP-hard,” Microsoft Research, Redmond, WA)
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Example of Bayesian Network Structure |
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