What does the UCR measure: activities of offenders, activities of complainants, oractivities of the police?

The Uniform Crime Reporting (UCR) program primarily measures the activities of offenders. It is a statistical program run by the Federal Bureau of Investigation (FBI) that collects data on crimes reported to law enforcement agencies across the United States. The UCR focuses on cataloging offenses known to the police, which includes serious crimes such as murder, rape, robbery, and aggravated assault, among others.

By recording the number of reported crimes, the UCR provides insight into crime trends and patterns within various regions. While it does involve the activities of police in terms of data collection and reporting, its main emphasis is on capturing the incidents of crime as they are reported by victims and witnesses rather than the activities of complainants or merely documenting police actions. Thus, it essentially reflects the actions and behaviors of offenders in terms of the crimes committed.