Overview of Anomaly Detections calculations

Anomaly Detections are calculated by gathering a statistically significant number of values for the monitored event or dimension over time and then calculating the standard deviation for the sampled values.

Anomaly Detections can be calculated on a daily or an hourly basis. Tracking hourly Anomaly Detections requires more storage capacity.

Note: Tracking of hourly Anomaly Detections is a feature of Unica Discover.

The calculated value of the standard deviation for today is based on the values that are calculated from the configured set of prior days.

  • Anomaly Detections may be calculated based on a consecutive days or week-over-week method. The method in use is configurable.

The number of days over which the Anomaly Detection is calculated is called the rolling window.

  • By default, the minimum number of days to complete a valid calculation is 4, and the maximum is 16.
  • The size of the rolling window may impact how quickly the Data Collector is able to complete its updates.
  • It does not affect Anomaly Detection data storage.