QAVCM
Carbon Markets
Methodology / Anomaly Detail

Anomaly Detail

Anomaly types, key drivers, affected fields, peer comparison, and action suggestions.

Total anomalies
3
High severity
2
Medium severity
1
VCS-687
Vintage outlier
high
Vintage significantly older than peer average for this type/region.
72
anomaly score
Key drivers
vintageEnd=2011 (pre-2012 high-penalty band)
Peer median vintage: 2019
No post-2015 batches present
Affected fields
batches.vintageEndqualitySignal.vintage_penalty
Peer comparison
Bottom 8% of REDD+ projects in the same region by vintage recency.
Suggested action
Monitor for newer vintage issuances. Consider flagging to compliance if portfolio vintage threshold applies.
Detected 4/18/2026
GS-9182
Credit volume spike
high
Issuance volume deviates >3σ from historical batch distribution.
88
anomaly score
VCS-191
Registry conflict
medium
Cross-registry mapping flagged conflicting vintage or quantity data.
45
anomaly score
Detection
Rule-based detection
Vintage bands, volume σ thresholds, cross-registry delta limits — deterministic rules applied on every ingest run.
Confidence scoring
Anomaly score 0–100: higher = more anomalous. Combines deviation magnitude, source reliability, and peer comparison percentile.
Severity assignment
High: score ≥ 75 or registry conflict. Medium: score 50–74. Low: score < 50 or staleness only.
Resolution
Anomalies are cleared when the root cause is resolved (e.g. fresh data ingested, mapping conflict dismissed in review).