UC-007_rates_anomaly_fairness_audit_Q1_2026.pdf
EV-2026-0142 ยท Test Results ยท linked to Rates valuation โ anomaly detection
Artefact ID
EV-2026-0142
Type
Test Results
Linked use case
Uploaded by
David Mwangi
Uploaded at
2026-05-15 13:55
Size
287 KB
SHA-256
4567โฆbb38 (truncated for display)
Hash chain
Verified ยท chained to previous entry
Summary
Fairness audit of the rates anomaly detection model across suburb and property-class dimensions. Confirms no disproportionate flagging of any single suburb beyond statistical expectation.
Chain of custody
Generated by Finance & Rates analytics team. Independently sample-checked by Risk Manager. Hash chained at upload.
Key facts
- Conclusion
- All deltas within ยฑ0.7% of baseline. No statistically significant disproportionate flagging.
- Statistical test
- Chi-squared, p=0.42 (>0.05 โ fail to reject null of equal flag rates)
- Next audit
- Quarterly cadence; next audit Q2 2026 due 2026-07-15
Flag rate by suburb (top 10 by property count, Q1 2026)
| Suburb | Properties | Flag rate | Baseline | ฮ vs baseline |
|---|---|---|---|---|
| Westbrook | 6420 | 4.2% | 4.0% | +0.2% |
| Brookdale | 3110 | 3.9% | 4.0% | โ0.1% |
| Westvale | 2880 | 4.5% | 4.0% | +0.5% |
| Southvale | 2104 | 3.8% | 4.0% | โ0.2% |
| Eastmoor | 1822 | 4.4% | 4.0% | +0.4% |
| Glenroy | 1488 | 4.1% | 4.0% | +0.1% |
| Redbank | 902 | 4.3% | 4.0% | +0.3% |
| Stoneleigh | 784 | 3.6% | 4.0% | โ0.4% |
| Northgate | 612 | 4.7% | 4.0% | +0.7% |
| Ashford | 488 | 3.9% | 4.0% | โ0.1% |