The statement “if an itemset is frequent then all of its subsets must also be frequent” describes _________ .
A. Unique item property
B. Downward closure property
C. Apriori property
D. Contrast set learning
Answer:B
The statement “if an itemset is frequent then all of its subsets must also be frequent” describes _________ .
A. Unique item property B. Downward closure property C. Apriori property D. Contrast set learning