AI & Digital Manufacturing Analytics worked example

Anomaly Detection Hit Rate at 81% target anomaly hit rate: a worked example

Push target anomaly hit rate up to 81% and the picture changes. This example computes every intermediate figure at that operating point. a maintenance or process monitoring owner needs to measure useful anomaly alerts versus total alerts

The inputs for this scenario

  • Confirmed useful anomaly alerts: 146 alerts (unchanged)
  • Total anomaly alerts: 240 alerts (unchanged)
  • Target anomaly hit rate: 81 % (raised for this scenario; the documented default is 70)

Working through the calculation

  • Applying the documented formula (Anomaly detection hit rate = confirmed useful anomaly alerts ÷ total anomaly alerts × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 60.83 % hit rate for anomaly detection hit rate, the number this scenario is built around.
  • At this operating point the engine returns 20.17 points for hit-rate gap to target.
  • At this operating point the engine returns 146 alerts for confirmed useful anomaly alerts.
  • At this operating point the engine returns 240 alerts for total anomaly alerts.

How this compares with the baseline

  • Against the tool's baseline example, where target anomaly hit rate sits at 70% and the headline result is 60.83 % hit rate, this scenario lands almost exactly on the baseline at 60.83 % hit rate.
  • It computes the percentage of total anomaly alerts that operators confirmed as useful, and the point gap between that rate and your target. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Anomaly detection hit rate: 60.83 % hit rate (headline result)
  • Hit-rate gap to target: 20.17 points
  • Confirmed useful anomaly alerts: 146 alerts
  • Total anomaly alerts: 240 alerts

Run it with your numbers

  • Every input above is editable in the live Anomaly Detection Hit Rate calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.