## Data Card — IEEE-CIS Fraud Detection

### Source
- Kaggle competition dataset: “IEEE-CIS Fraud Detection”
- Files used: `train_transaction.csv` (+ optional `train_identity.csv`)

### Target
- `isFraud` (1 = fraud)

### Preprocessing
- Selected compact feature subset for portability
- Frequency encoding for selected categorical fields
- Median imputation for numeric missing values

### License / access
- You must accept the Kaggle competition rules to download the data.
- This repository does **not** redistribute the dataset.