Fraud Detection and Prevention

  1. Data and Feature Engineering for Fraud Detection
    1. Data Sources
      1. Transactional Data
        1. Payment Transactions
          1. Account Transactions
            1. Transfer Records
              1. Purchase Histories
                1. Refund Records
                2. User Profile Data
                  1. Demographic Information
                    1. Account Creation Details
                      1. Account Status History
                        1. Contact Information
                          1. Verification Status
                          2. Behavioral Data
                            1. Clickstream Data
                              1. Session Duration
                                1. Page Views
                                2. Device Fingerprinting
                                  1. Device Identification
                                    1. Browser Information
                                      1. Operating System Data
                                        1. Screen Resolution
                                        2. Geolocation Data
                                          1. IP Address Location
                                            1. GPS Coordinates
                                              1. Time Zone Information
                                            2. Third-Party Data
                                              1. Credit Bureau Data
                                                1. Credit Scores
                                                  1. Credit History
                                                    1. Credit Inquiries
                                                    2. Public Records
                                                      1. Court Records
                                                        1. Business Registrations
                                                          1. Property Records
                                                          2. Social Media Data
                                                            1. Profile Verification
                                                              1. Social Network Analysis
                                                                1. Activity Patterns
                                                              2. Network and Infrastructure Data
                                                                1. Server Logs
                                                                  1. Network Traffic Data
                                                                    1. Security Event Logs
                                                                  2. Data Quality and Preprocessing
                                                                    1. Data Quality Assessment
                                                                      1. Completeness Analysis
                                                                        1. Accuracy Validation
                                                                          1. Consistency Checks
                                                                            1. Timeliness Evaluation
                                                                            2. Missing Data Handling
                                                                              1. Missing Data Patterns
                                                                                1. Imputation Methods
                                                                                  1. Mean Imputation
                                                                                    1. Median Imputation
                                                                                      1. Mode Imputation
                                                                                        1. Forward Fill
                                                                                          1. Backward Fill
                                                                                          2. Deletion Strategies
                                                                                            1. Listwise Deletion
                                                                                              1. Pairwise Deletion
                                                                                            2. Data Normalization
                                                                                              1. Min-Max Scaling
                                                                                                1. Z-Score Standardization
                                                                                                  1. Robust Scaling
                                                                                                    1. Unit Vector Scaling
                                                                                                    2. Outlier Detection and Treatment
                                                                                                      1. Statistical Methods
                                                                                                        1. Z-Score Method
                                                                                                          1. IQR Method
                                                                                                            1. Modified Z-Score
                                                                                                            2. Machine Learning Methods
                                                                                                              1. Isolation Forest
                                                                                                                1. Local Outlier Factor
                                                                                                                2. Treatment Strategies
                                                                                                                  1. Removal
                                                                                                                    1. Transformation
                                                                                                                      1. Capping
                                                                                                                    2. Categorical Data Encoding
                                                                                                                      1. One-Hot Encoding
                                                                                                                        1. Label Encoding
                                                                                                                          1. Target Encoding
                                                                                                                            1. Binary Encoding
                                                                                                                              1. Frequency Encoding
                                                                                                                              2. Data Deduplication
                                                                                                                                1. Exact Matching
                                                                                                                                  1. Fuzzy Matching
                                                                                                                                    1. Record Linkage
                                                                                                                                  2. Feature Engineering
                                                                                                                                    1. Domain-Specific Features
                                                                                                                                      1. Transaction Features
                                                                                                                                        1. Amount-Based Features
                                                                                                                                          1. Frequency Features
                                                                                                                                            1. Location Features
                                                                                                                                            2. Account Features
                                                                                                                                              1. Age Features
                                                                                                                                                1. Activity Features
                                                                                                                                                  1. Balance Features
                                                                                                                                                2. Time-Based Features
                                                                                                                                                  1. Temporal Patterns
                                                                                                                                                    1. Hour of Day
                                                                                                                                                      1. Day of Week
                                                                                                                                                        1. Month of Year
                                                                                                                                                          1. Seasonality
                                                                                                                                                          2. Recency Features
                                                                                                                                                            1. Time Since Last Transaction
                                                                                                                                                              1. Time Since Account Creation
                                                                                                                                                                1. Time Since Last Login
                                                                                                                                                                2. Frequency Features
                                                                                                                                                                  1. Transactions per Hour
                                                                                                                                                                    1. Transactions per Day
                                                                                                                                                                      1. Login Frequency
                                                                                                                                                                      2. Velocity Features
                                                                                                                                                                        1. Transaction Velocity
                                                                                                                                                                          1. Amount Velocity
                                                                                                                                                                            1. Location Velocity
                                                                                                                                                                          2. Aggregation Features
                                                                                                                                                                            1. User-Level Aggregates
                                                                                                                                                                              1. Total Transaction Amount
                                                                                                                                                                                1. Average Transaction Amount
                                                                                                                                                                                  1. Transaction Count
                                                                                                                                                                                    1. Unique Merchant Count
                                                                                                                                                                                    2. Merchant-Level Aggregates
                                                                                                                                                                                      1. Transaction Volume
                                                                                                                                                                                        1. Customer Count
                                                                                                                                                                                          1. Fraud Rate
                                                                                                                                                                                            1. Chargeback Rate
                                                                                                                                                                                            2. Device-Level Aggregates
                                                                                                                                                                                              1. Account Count per Device
                                                                                                                                                                                                1. Transaction Volume per Device
                                                                                                                                                                                                  1. User Count per Device
                                                                                                                                                                                                  2. Location-Level Aggregates
                                                                                                                                                                                                    1. Transaction Count per Location
                                                                                                                                                                                                      1. User Count per Location
                                                                                                                                                                                                        1. Velocity per Location
                                                                                                                                                                                                      2. Network and Graph Features
                                                                                                                                                                                                        1. Node Features
                                                                                                                                                                                                          1. Degree Centrality
                                                                                                                                                                                                            1. Betweenness Centrality
                                                                                                                                                                                                              1. Closeness Centrality
                                                                                                                                                                                                              2. Edge Features
                                                                                                                                                                                                                1. Connection Strength
                                                                                                                                                                                                                  1. Transaction Frequency
                                                                                                                                                                                                                    1. Amount Flow
                                                                                                                                                                                                                    2. Community Features
                                                                                                                                                                                                                      1. Community Membership
                                                                                                                                                                                                                        1. Community Size
                                                                                                                                                                                                                          1. Inter-Community Connections
                                                                                                                                                                                                                        2. Feature Selection
                                                                                                                                                                                                                          1. Filter Methods
                                                                                                                                                                                                                            1. Correlation Analysis
                                                                                                                                                                                                                              1. Chi-Square Test
                                                                                                                                                                                                                                1. Mutual Information
                                                                                                                                                                                                                                2. Wrapper Methods
                                                                                                                                                                                                                                  1. Forward Selection
                                                                                                                                                                                                                                    1. Backward Elimination
                                                                                                                                                                                                                                      1. Recursive Feature Elimination
                                                                                                                                                                                                                                      2. Embedded Methods
                                                                                                                                                                                                                                        1. LASSO Regularization
                                                                                                                                                                                                                                          1. Ridge Regularization
                                                                                                                                                                                                                                            1. Tree-Based Feature Importance
                                                                                                                                                                                                                                          2. Dimensionality Reduction
                                                                                                                                                                                                                                            1. Principal Component Analysis
                                                                                                                                                                                                                                              1. Linear Discriminant Analysis
                                                                                                                                                                                                                                                1. t-SNE
                                                                                                                                                                                                                                                  1. UMAP

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                                                                                                                                                                                                                                              1. Introduction to Fraud

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                                                                                                                                                                                                                                              3. Fraud Detection Methodologies