Consider the frequent closed itemset lattice shown in Figure 9.7. Assume that the item space is I = {A, B, C, D, E}. Answer the following questions   (a) What is the frequency of CD? (b) Find all frequent itemsets and their frequency in the subset interval [B, ABD]. (c) Is ADE frequent? If yes, show its support. If not, why?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Consider the frequent closed itemset lattice shown in Figure 9.7. Assume that the item space is I = {A, B, C, D, E}. Answer the following questions

 

(a) What is the frequency of CD?

(b) Find all frequent itemsets and their frequency in the subset interval [B, ABD].

(c) Is ADE frequent? If yes, show its support. If not, why?

АВСD(3)
BC(5)
АBD(6)
B(8)
Transcribed Image Text:АВСD(3) BC(5) АBD(6) B(8)
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