Analytics
Anomaly Alert
Scores each row's value against the rest (z-score or IQR) and routes unusual rows to the Alert pin and the others to Normal, with an optional quiet period after each alert.
When to use it
Use it to raise an alarm on odd totals — a spike in orders, a sensor out of range — and send those rows to Notify or a review queue.
In a pipeline
File InputAnomaly AlertNotify
Settings
| Setting | Type | Required | Default or hint |
|---|---|---|---|
| Column | select | Yes | Select column… |
| Method | select | — | zscore |
| Threshold | number | — | Empty: 3 σ · 1.5 IQR |
| Quiet rows after an alert | number | — | 0 |
| Score column name | text | — | Default: Anomaly Score |
Example
Flag a spike in orders
- Column=Orders
- Threshold=2
| Day | Orders |
|---|---|
| Mon | 102 |
| Tue | 98 |
| Wed | 105 |
| Thu | 340 |
| Fri | 101 |
| Day | Orders | Anomaly Score |
|---|---|---|
| Thu | 340 | 2.041 |
The five rows above plus Saturday's 99: mean 140.83, σ 97.6, so only Thursday is beyond ±2.
Worth knowing
- Every row gets the Anomaly Score (z-score, or IQRs beyond the nearer fence); rows that are not numbers score blank and stay on Normal.
- Quiet rows after an alert keeps a run of unusual rows from alerting again and again: within that many rows of an alert, unusual rows stay on Normal and the note counts them.
- Edges without a pin label take the Normal pin. To only mark rows, use Outlier Detection instead.