Implicit data collection

Implicit data collection is used in human–computer interaction to gather data about the user in an implicit, non-invasive way.

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Concepts
Collective intelligence Relevance Star ratings Long tail
Methods and challenges
Cold start Collaborative filtering Dimensionality reduction Implicit data collection Item-item collaborative filtering Matrix factorization Preference elicitation Similarity search
Implementations
Collaborative search engine Content discovery platform Decision support system Music Genome Project Product finder
Research
GroupLens Research MovieLens Netflix Prize ACM Conference on Recommender Systems