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- We are drowning in data, but starving for knowledge
- Data mining is using data to discover knowledge
- Non-trivial, implicit, previously unknown and potentially useful patterns or knowledge from huge amounts of data
- Data collection and data availability
- Automated data collection tools, database systems, web, computerized society
- Major sources of abundant data
- Business → web, e-commerce, transactions, stocks
- Science → remote sensing, bioinformatics, scientific simulation
- Society → news, digital camera, YouTube
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