Just found this on the Richmond City website, seems relevant to any conversation about crime rates. Sounds like not a huge effect, but still meaningful.
https://www.ci.richmond.ca.us/4010/Crime-Statistics-Reports
https://ucr.fbi.gov/nibrs/2014/resource-pages/effects_of_nibrs_on_crime_statistics_final.pdf
"Important Changes in Crime Statistics Reporting
For decades, the Federal Bureau of Investigation (FBI) has collected national crime data from law enforcement agencies, including the Richmond Police Department.
Before 2021, California utilized the Summary Uniform Crime Reporting (UCR) method, often referred to as “Part I & Part II Crimes,” to report crime statistics to the FBI. Effective January 1, 2021, the National Incident Based Reporting System (NIBRS) will replace UCR as the nationwide crime data reporting system. The implementation of NIBRS is expected to provide consistency throughout the U.S. and will bring improved detail and a more transparent approach to crime reporting for the public.
Effective January 1, 2023, the Crime Analysis Unit will begin utilizing the NIBRS data collection method for the City's Monthly Crime Stat Reports.
Comparing UCR to NIBRS
UCR NIBRS
Consists of monthly aggregate crime count for 8 Index crimes
Records one offense per incident as determined by the hierarchy rule
The hierarchy rule suppresses counts of lesser offenses in multiple-offense incidents
It does not distinguish between attempted and completed crimes
Collects weapon information for murder, robbery, and aggravated assault
Provides counts on arrests for the 8 Index crimes and 21 other offenses
NIBRS collects data about victims, known offenders, and relationships for offenses reported in 23 categories with 52 offenses. It also presents arrest data for those crimes, as well as 10 additional categories for which only arrest data is collected
Records each offense occurring in an incident
Distinguishes between attempted and completed crimes
Restructures the definition of assault
Collects weapon information for all violent offenses
With this transition, the perception may be that the City of Richmond's lower-level crime statistics have increased. This change in reporting is not expected to reflect an actual increase in crime, but rather a change in the way crimes will be reported. It is also expected that NIBRS will produce more detailed, accurate, and meaningful data because it also captures when and where crime takes place, what form it takes, and the characteristics of its victims and perpetrators. "