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Data Analysis Using SQL and Excel - Second Edition
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Item sets are interesting. Association rules transform the item sets into rules. This section starts the discussion of association rules by calculating the proportion of orders that have a given product. These are the simplest, most basic type of association rule, one where the “if” clause is empty and the “then” clause contains one product: Given no information, what is the probability that a given product is an order? This idea of “zero-way” association rules is useful for two reasons. First, it provides a simple introduction to the ideas and terminology. Second, this overall probability is important for assessing more complex rules.
An association is a group of products that appear together—typically in an order, but the hierarchy could be at any level. The word “association” implies that the products have a relationship with each other based on the fact that they are...
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