Leggere, an internet book retailer, is interested in better understanding the purchase decisions of its customers. For a set of 2,000 customer transactions, it has categorized the individual book purchases comprising those transactions into one or more of the following categories: Novels, Willa Bean series, Cooking Books, Bob Villa Do-It-Yourself, Youth Fantasy, Art Books, Biography, Cooking Books by Mossimo Bottura, Harry Potter series, Florence Art Books, and Titian Art Books. Leggere has conducted association rules analysis on this data set and would like to analyze the output. Based on a minimum support of 200 transactions and a minimum confidence of 50%, the table below shows the top 10 rules with respect to lift ratio. Explain why the top rule “If customer buys a Bottura cooking book, then they buy a cooking book,” is not helpful even though it has the largest lift and 100% confidence. Antecedent Consequent Support for A Support C Support for A and C Confidence Ratio Bottura Cooking Cooking 227 862 227 100.00 2.32 Explain how the confidence of 52.99% and lift ratio of 2.20 was computed for the rule “If a customer buys a cooking book and a biography book, then they buy an art book.” Interpret these quantities Antecedent Consequent Support for A Support C Support for A and C Confidence Ratio Cooking, Biography Art 385 482 204 52.99 2.20

Practical Management Science

6th Edition

ISBN:9781337406659

Author:WINSTON, Wayne L.

Publisher:WINSTON, Wayne L.

Chapter2: Introduction To Spreadsheet Modeling

Section: Chapter Questions

Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...

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Leggere, an internet book retailer, is interested in better understanding the purchase decisions of its customers. For a set of 2,000 customer transactions, it has categorized the individual book purchases comprising those transactions into one or more of the following categories: Novels, Willa Bean series, Cooking Books, Bob Villa Do-It-Yourself, Youth Fantasy, Art Books, Biography, Cooking Books by Mossimo Bottura, Harry Potter series, Florence Art Books, and Titian Art Books. Leggere has conducted association rules analysis on this data set and would like to analyze the output. Based on a minimum support of 200 transactions and a minimum confidence of 50%, the table below shows the top 10 rules with respect to lift ratio.

Explain why the top rule “If customer buys a Bottura cooking book, then they buy a cooking book,” is not helpful even though it has the largest lift and 100% confidence.

Antecedent	Consequent	Support for A	Support C	Support for A and C	Confidence	Ratio
Bottura Cooking	Cooking	227	862	227	100.00	2.32

Explain how the confidence of 52.99% and lift ratio of 2.20 was computed for the rule “If a customer buys a cooking book and a biography book, then they buy an art book.” Interpret these quantities

Antecedent	Consequent	Support for A	Support C	Support for A and C	Confidence	Ratio
Cooking, Biography	Art	385	482	204	52.99	2.20

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