Real Time Crime Index

The RTCI is a sample of reported crime data from hundreds of law enforcement agencies nationwide which mimics national crime trends with as little lag and the most accuracy possible. Crime statistics are inexact, but sampling agencies in this way is a proven method for accurately measuring trends while waiting for national crime estimates published each year. Standardizing the offenses collected and time periods measured from hundreds of agencies makes it possible to evaluate trends up or down as they develop.

Not all crimes are reported to police, and the RTCI can only measure those offenses that are reported to police. Crime data is inherently imprecise with frequent (usually small) variations between different data sources. This methodology is designed to ensure that crime trends are being captured accurately even if the exact figures reported either publicly by an agency or by the FBI may differ depending on the available data source. Not every agency in the RTCI has available data for every offense type; it does not include every agency in the RTCI or U.S. The number of agencies and population coverage for the full sample for other crimes is slightly smaller than the full nationwide sample for murder.

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