Consider the data set shown in Table 7.4. Suppose we apply the fol- lowing discretization strategies to the continuous attributes of the data set.
D1: Partition the range of each continuous attribute into 3 equal-sized
bins.
D2: Partition the range of each continuous attribute into 3 bins; where
each bin contains an equal number of transactions
For each strategy, answer the following questions:
i. Construct a binarized version of the data set.
ii. Derive all the frequent itemsets having support ? 30%.
Table 7.5 shows the discretized data using D1, where the discretized
intervals are:
• X1: Temperature between 80 and 87,
• X2: Temperature between 88 and 95,
• X3: Temperature between 96 and 103,
• Y1: Pressure between 1025 and 1051,
• Y2: Pressure between 1052 and 1078,
• Y3: Pressure between 1079 and 1105.
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