The phrase "incident rate" refers to the measurement of how often a particular event or occurrence happens within a specific time period. It helps determine the frequency or likelihood of an incident taking place. Full definition
I want to add another point that especially stopping terrorism is nearly impossible for a moderate majority because of the extremely low incident rate. (politics.stackexchange.com)
In 2013, it was reported that Manitoba had the second highest incident rate of violence against women in Canada. (slaw.ca)
However, statistics indicate that 1979 had the highest incident rate of truck accident fatalities since U.S. crash data was first collected in 1975. (chicagotruckinjurylawyers.com)