Data Cleaning

  1. Techniques for Handling Missing Data
    1. Missing Data Analysis
      1. Missingness Pattern Identification
        1. Missing Data Visualization
          1. Pattern Matrix Analysis
            1. Correlation Analysis
            2. Missingness Mechanism Testing
              1. Little's MCAR Test
                1. Missing Data Imputation Tests
                  1. Sensitivity Analysis
                  2. Impact Assessment
                    1. Bias Evaluation
                      1. Power Analysis
                        1. Representativeness Check
                      2. Deletion Methods
                        1. Complete Case Analysis
                          1. Listwise Deletion
                            1. Advantages and Limitations
                              1. When to Use
                              2. Available Case Analysis
                                1. Pairwise Deletion
                                  1. Variable-Specific Deletion
                                    1. Analysis Considerations
                                    2. Threshold-Based Deletion
                                      1. Column Deletion Criteria
                                        1. Row Deletion Criteria
                                          1. Threshold Selection
                                          2. Conditional Deletion
                                            1. Business Rule-Based Deletion
                                              1. Pattern-Based Deletion
                                                1. Context-Specific Deletion
                                              2. Single Imputation Methods
                                                1. Central Tendency Imputation
                                                  1. Mean Imputation
                                                    1. Arithmetic Mean
                                                      1. Trimmed Mean
                                                        1. Weighted Mean
                                                        2. Median Imputation
                                                          1. Simple Median
                                                            1. Grouped Median
                                                              1. Conditional Median
                                                              2. Mode Imputation
                                                                1. Simple Mode
                                                                  1. Conditional Mode
                                                                    1. Multiple Modes Handling
                                                                  2. Constant Value Imputation
                                                                    1. Zero Imputation
                                                                      1. Domain-Specific Constants
                                                                        1. Business Logic Constants
                                                                        2. Random Imputation
                                                                          1. Random Sample Imputation
                                                                            1. Stratified Random Imputation
                                                                              1. Weighted Random Imputation
                                                                              2. Forward and Backward Fill
                                                                                1. Forward Fill (Last Observation Carried Forward)
                                                                                  1. Backward Fill
                                                                                    1. Interpolation Methods
                                                                                  2. Advanced Imputation Techniques
                                                                                    1. Regression Imputation
                                                                                      1. Linear Regression
                                                                                        1. Multiple Regression
                                                                                          1. Logistic Regression
                                                                                            1. Polynomial Regression
                                                                                            2. Machine Learning Imputation
                                                                                              1. K-Nearest Neighbors (KNN)
                                                                                                1. Distance Metrics
                                                                                                  1. K Selection
                                                                                                    1. Weighted KNN
                                                                                                    2. Decision Tree Imputation
                                                                                                      1. Random Forest Imputation
                                                                                                        1. Support Vector Machine Imputation
                                                                                                        2. Multiple Imputation
                                                                                                          1. Multiple Imputation by Chained Equations (MICE)
                                                                                                            1. Fully Conditional Specification
                                                                                                              1. Joint Modeling Approach
                                                                                                                1. Pooling Results
                                                                                                                2. Time Series Imputation
                                                                                                                  1. Linear Interpolation
                                                                                                                    1. Spline Interpolation
                                                                                                                      1. Seasonal Decomposition
                                                                                                                        1. ARIMA-Based Imputation
                                                                                                                        2. Hot Deck Imputation
                                                                                                                          1. Random Hot Deck
                                                                                                                            1. Sequential Hot Deck
                                                                                                                              1. Distance-Based Hot Deck
                                                                                                                            2. Indicator Variables and Flags
                                                                                                                              1. Missing Indicator Creation
                                                                                                                                1. Binary Flags
                                                                                                                                  1. Categorical Indicators
                                                                                                                                    1. Continuous Indicators
                                                                                                                                    2. Missingness Pattern Encoding
                                                                                                                                      1. Pattern Identification
                                                                                                                                        1. Pattern Clustering
                                                                                                                                          1. Pattern-Based Features
                                                                                                                                          2. Impact Analysis
                                                                                                                                            1. Missingness Effect Modeling
                                                                                                                                              1. Interaction Analysis
                                                                                                                                                1. Predictive Power Assessment
                                                                                                                                              2. Imputation Quality Assessment
                                                                                                                                                1. Validation Techniques
                                                                                                                                                  1. Cross-Validation
                                                                                                                                                    1. Hold-Out Validation
                                                                                                                                                      1. Bootstrap Validation
                                                                                                                                                      2. Distribution Comparison
                                                                                                                                                        1. Statistical Tests
                                                                                                                                                          1. Visual Comparison
                                                                                                                                                            1. Moment Matching
                                                                                                                                                            2. Bias Assessment
                                                                                                                                                              1. Imputation Bias Measurement
                                                                                                                                                                1. Variance Inflation
                                                                                                                                                                  1. Coverage Probability
                                                                                                                                                                  2. Sensitivity Analysis
                                                                                                                                                                    1. Multiple Imputation Comparison
                                                                                                                                                                      1. Method Robustness Testing
                                                                                                                                                                        1. Assumption Validation

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                                                                                                                                                                    4. Common Types of Data Quality Issues

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                                                                                                                                                                    6. Techniques for Correcting Inaccurate Data