Types of Collaborative Filtering Algorithms Collaborative filters Statistical collaborative filters Probabilistic Collaborative Filters [PHlooj Bayesian Filters [BP9 9][BHK98] Association Rules [agrawal, Han] Open problems Sparsity First Rater, scalability5 Types of Collaborative Filtering Algorithms ◼ Collaborative Filters ◼ Statistical Collaborative Filters ◼ Probabilistic Collaborative Filters [PHL00] ◼ Bayesian Filters [BP99][BHK98] ◼ Association Rules [Agrawal, Han] ◼ Open Problems ◼ Sparsity, First Rater, Scalability