Association rules, sometimes referred to as market basket analysis, tell us which items or entities occur together the most often in a large database of transactions. Transactions are typically financial, as in sales and purchases, or technological, as in calls or web links. Association rules have applications in many fields, but especially in marketing, anomaly detection and recommendation, giving us the original those who watched/bought X also watched/bought Y and Z recommendations.
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Overview of association rules in Enterprise Miner - Blackboard electronic reserves
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Association Rules in SAS Enterprise Miner - Blackboard electronic reserves
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Introduction to Data Mining
Chapter 6