4. Efim modified algorithm (MEFIM)
Applying the formula for calculating the useful value in definition 3 to convert the transaction into a structure such as table 3 to apply to mining algorithms useful set the previous high . Currently, Efim is considered mining algorithms useful collection efficiency, we choose the most applicable formula 3 and defined in this algorithm is called MEFIM algorithms.
Unlike Efim, MEFIM changed in line 2nd line, conversion transactions in the process of reading the data and places related to the use of formula (1) calculate the value of items useful in transaction T i (see definition 3) before useful when calculating the value of the transaction initiates. For formula (1), Efim and MEFIM only changed the formula for calculating the useful value of the elements of each transaction should be considered in complexity and efficiency of the algorithm 2 unchanged.
4.1. Algorithm MEFIM
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