Question: The most important reason that statistical anomaly - based intrusion detection systems ( stat IDSs ) are less commonly used than signature - based IDSs

The most important reason that statistical anomaly-based intrusion detection systems (stat IDSs) are less commonly used than signature-based IDSs is that stat IDSs:
create more overhead than signature-based ideas
generate false alarms from varying user or system actions
cause false positives from minor changes to system variables

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