Add README

README.md

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+---
+license: apache-2.0
+tags:
+- healthcare
+- hospital-readmission
+- threshold-optimization
+- roi-analysis
+---
+
+# Hospital Readmission Risk - Phase 4: Threshold Optimization Results
+
+This repository contains the results from Phase 4: Optimal Threshold & ROI Analysis.
+
+## Contents
+
+### Outputs
+- `outputs/optimal_thresholds.json`: Optimal decision threshold and risk category thresholds
+- `outputs/roi_metrics.json`: Comprehensive ROI metrics
+- `outputs/roi_report.txt`: Human-readable ROI analysis report
+- `outputs/threshold_results.csv`: Expected value across all tested thresholds
+
+### Visualizations
+1. Expected Value vs Threshold Curve
+2. Cost-Benefit Analysis
+3. Classification Metrics vs Threshold
+4. Confusion Matrix at Optimal Threshold
+5. Risk Category Distribution
+6. ROI Sensitivity Analysis
+7. Intervention Volume Forecast
+8. Cost Savings Projection
+
+## Usage
+
+These results can be used for:
+- Implementing the optimal decision threshold in production
+- Defining risk categories for clinical decision support
+- Justifying intervention programs to stakeholders
+- Planning resource allocation
+- Proceeding to Phase 5: Fairness Evaluation
+
+## Citation
+
+If you use these results, please cite the hospital readmission risk prediction project.