Question
A financial institution has noisy, missing and inconsistent customer data. Explain suitable data preprocessing techniques including cleaning, integration, transformation, reduction and discretization before mining.
Answer :
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Data preprocessing is a fundamental step in data warehousing and data mining because the quality of mining results depends directly on the quality of the input data. A financial institution often collects customer information from multiple sources such as bank branches, online banking platforms, mobile applications, credit card systems, insurance records, and loan management systems. Such data frequently contains noise, missing values, inconsistencies, duplicates, and redundant attributes. Before applying mining algorithms for fraud detection, customer segmentation, credit risk analysis, or loan approval, appropriate preprocessing techniques must be applied. Data cleaning is the first and most important preprocessing step. It aims to detect and correct errors in the dataset. Missing values in customer information, such as income, address, occupation, or contact details, may occur because of incomplete forms or system failures. These missing values can be handled by ignoring records with excessive missing information, replacing missing values with a global constant, filling them with the attribute mean or median, or estimating them using predictive methods such as regression or classification. Noisy data, such as incorrect account balances, typing
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