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Association Rules (Introduction (Initial proposed for market basketā¦
Association Rules
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Concepts
Lift
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\(Lift(X \rightarrow Y) = \frac{Sup(X,Y)}{Sup(X)Sup(Y)} \)
Support
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\(Sup(X,Y) = \frac{|X,Y|}{transaction} \)
Confidence
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\(Conf(X\rightarrow Y) = \frac {Sup(X,Y)}{Sup(X)} \)
Apriori Algorithm
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Implementation
- Start with k =1
- Calculate support and keep frequent š-item sets that has enough support
- In each iteration, generate frequent k+1 item sets from frequent k-item sets
- Calculate support and keep frequent š+1 item sets that has enough support
- Repeat 3 & 4 until no more frequent item set
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