4. Affinity grouping or association rules: goal is to explore an available data set to determine which data instances should be grouped together
This involves discovering relationships among data
Which items should be placed near each other in a supermarket?
What items do customers buy together
5. Clustering: sort undifferentiated data into like groups
This does not begin with predefined classes
What do the book and music purchases tell us about our customers?
III. Examples of web services
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