Web Reference: Dec 3, 2025 · Missing values appear when some entries in a dataset are left blank, marked as NaN, None or special strings like "Unknown". If not handled properly, they can reduce accuracy, create bias and break algorithms that require complete data. Oct 18, 2024 · Handling missing data efficiently is a key part of the data preprocessing pipeline in machine learning. Fortunately, many tools and libraries offer built-in functions and methods to handle missing values. Sep 1, 2025 · We subsequently address missing data using five methods: complete case analysis (CCA), mean imputation, hot deck imputation, regression imputation, and multiple imputation (MI). Statistical tests are conducted on the machine learning outcomes, and the findings are presented and analyzed.
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