A program may change its response to a signal
A. at any time
B. only at the start of the program
A. at any time
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The original association rule mining framework considers only presence of items together in the same transaction. There are situations in which itemsets that are infrequent may also be informative. For instance, the itemset TV, DVD, ¬ VCR suggests that many customers who buy TVs and DVDs do not buy VCRs. In this problem, you are asked to extend the association rule framework to negative itemsets (i.e., itemsets that contain both presence and absence of items). We will use the negation symbol (¬) to refer to absence of items.
(a) A na ??ve way for deriving negative itemsets is to extend each transaction
to include absence of items as shown in Table 7.17.
i. Suppose the transaction database contains 1000 distinct items.
What is the total number of positive itemsets that can be generated from these items? (Note: A positive itemset does not contain
any negated items).
ii. What is the maximum number of frequent itemsets that can be
generated from these transactions? (Assume that a frequent item-
set may contain positive, negative, or both types of itemsiii. Explain why such a na ??ve method of extending each transaction
with negative items is not practical for deriving negative itemsets.
The default file format for Excel 2013 files is ________
Fill in the blank(s) with correct word
MembersThe tblMembers table contains six fields. The LastName, FirstName, and MemberType fields contain text. The MemberID, JoinDate, and Fee fields contain numbers. The MemberType field contains one of the following letters: F for Family membership, A for one Adult membership, Y for one Youth membership, and S for one Senior membership. Write a SQL SELECT statement that allows the user to provide a specific MemberID. The query should select all fields.
What will be an ideal response?
Browser ________ allow your browser to queue up multiple Web pages so that you can easily switch between them.
Fill in the blank(s) with the appropriate word(s).