Final answer:
The NCVS and UCR provide different perspectives on where crime occurs, with NCVS potentially capturing more due to its self-report nature, while UCR focuses on reported offenses, though both agree on the decline in crime rates since the 1990s.
Step-by-step explanation:
The National Crime Victimization Survey (NCVS) and the Uniform Crime Reports (UCR) both provide data on crime occurrences in the United States, but they have different scopes and methodologies. The UCR collects data from law enforcement agencies, which results in a compilation of crimes reported to the police.
However, it does not capture crimes that go unreported. On the other hand, the NCVS is a self-report survey that gathers information about crime victimization through questionnaires and interviews, potentially capturing unreported crimes as well.
Both sources agree on the overall decline in crime rates, particularly for violent and gun-related crimes since the early 1990s but may differ in details due to their data collection methods.