AI & Digital Manufacturing Analytics worked example

Anomaly Detection Hit Rate at 50% target anomaly hit rate: a worked example

Suppose target anomaly hit rate falls to 50%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Calculate anomaly detection hit rate from confirmed useful alerts, total anomaly alerts, and a target hit-rate percentage.

The inputs for this scenario

  • Confirmed useful anomaly alerts: 146 alerts (held at the documented default)
  • Total anomaly alerts: 240 alerts (held at the documented default)
  • Target anomaly hit rate: 50 % (the input this scenario stresses; the baseline uses 70)

Working through the calculation

  • The calculation starts from the formula this tool documents: Anomaly detection hit rate = confirmed useful anomaly alerts ÷ total anomaly alerts × 100.
  • Anomaly detection hit rate works out to 60.83 % hit rate at these inputs, and this is the headline figure for the scenario.
  • Hit-rate gap to target works out to -10.83 points at these inputs.
  • Confirmed useful anomaly alerts works out to 146 alerts at these inputs.
  • Total anomaly alerts works out to 240 alerts at these inputs.

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. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Anomaly detection hit rate: 60.83 % hit rate (headline result)
  • Hit-rate gap to target: -10.83 points
  • Confirmed useful anomaly alerts: 146 alerts
  • Total anomaly alerts: 240 alerts

Run it with your numbers

  • To rerun this with your own numbers, open the live Anomaly Detection Hit Rate calculator, set target anomaly hit rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.