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The book is rich in examples and they all use real data. This point is worth saying more about. Unrealistic datasets lead to unrealistic results. This is frustrating to the student. In real life, the more you know about the business context, the better your data mining results will be. Subject matter expertise gives you a head start . You know what variables ought to be predictive and have good ideas Foreword xxxv about new ones to derive. Fake data does not reward these good ideas because patterns that should be in the data are missing and patterns that shouldn't be there have been introduced inadvertently. Real data is hard to come by, not least because real data may reveal more than its owners are willing to share about their business operations.
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