The specific amendments are as follows:1. Statements of the formulas to calculate the useful of the itemset on transactions have profit changes.2. Modify the EFIM MEFIM algorithm algorithm to exploit HUI on the DATABASE change profit.After that, we continued to improve the modified MEFIM algorithm to exploit HUI more effectively, a number of improvements are as follows:-To propose the structure P-set with the purpose of limiting the number of transactions involved directly in the process of exploiting the high useful. -Propose the method of reverse projection on P-set between the candidate and the reviewed data is intended to limit the number of transactions involved the creation of new data projection for the expansion set of candidates and to calculate the useful volume of applicants.-Improved algorithm suggestions from iMEFIM algorithm based on P-set.
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