And without a concrete way to measure the incidence of domestic violence, it is purely observational.
The incidence of Type-2 diabetes in American adolescents has increased 10 times over the last decade.
Only with a regime like that will we see their incidence decrease.
early 15c., "incidental matter," from Middle French incidence (15c.), from Late Latin incidentia (see incident (n.)). Meaning "act of coming into contact with" is from 1650s; sense in physics is from 1620s.
incidence in·ci·dence (ĭn'sĭ-dəns)
The extent or rate of occurrence, especially the number of new cases of a disease in a population over a period of time.
The arrival of radiation or a projectile at a surface.