1. Consider the following set of frequent 3-itemsets: (1,2,3}, {1,2,4}, {1,2,5}, {1,3,4}, {2,3,4}, {2,3,5), {3,4,6). Assume that the only items in the data set are: {1},{2},{3},(4},{5},{6). All the 1-itemsets are frequent. a. List all candidate 4-itemsets (and the corresponding itemsets that were merged) obtained by candidate generation procedure using the Fk-1 x F1 merging strategy(w/ lexicographical order). b. List all candidate 4-itemsets (and the corresponding itemsets that were merged) obtained by candidate generation procedure in Apriori (Fk-1 × Fk-1 merging strategy). c. Out of the candidate 4-itemsets in (b.), which itemsets survive the candidate pruning step of the Apriori algorithm? For the itemsets that do not survive, note why they did not survive.

1. Consider the following set of frequent 3-itemsets: (1,2,3}, {1,2,4}, {1,2,5}, {1,3,4}, {2,3,4}, {2,3,5), {3,4,6). Assume that the only items in the data set are: {1},{2},{3},(4},{5},{6). All the 1-itemsets are frequent. a. List all candidate 4-itemsets (and the corresponding itemsets that were merged) obtained by candidate generation procedure using the Fk-1 x F1 merging strategy(w/ lexicographical order). b. List all candidate 4-itemsets (and the corresponding itemsets that were merged) obtained by candidate generation procedure in Apriori (Fk-1 × Fk-1 merging strategy). c. Out of the candidate 4-itemsets in (b.), which itemsets survive the candidate pruning step of the Apriori algorithm? For the itemsets that do not survive, note why they did not survive.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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