New Learning Guide: Using the Law Enforcement Agency Identifiers Crosswalk (LEAIC)

NACJD has released a new learning guide which shows how to use the Law Enforcement Agency Identifiers Crosswalk (LEAIC) file.

The LEAIC facilitates criminal justice research by acting as a crosswalk between agency-level crime data and other types of aggregate data which use different place identifiers. For example, while FBI crime data uses Originating Agency Identifier (ORI) codes to identify reporting agencies, U.S. Census uses Federal Information Processing Standards (FIPS) codes to identify locations. This discrepancy makes it difficult to link area-level crime data with data on socioeconomic and demographic context. The LEAIC file includes both ORI and FIPS codes, thus allowing researchers to link FBI data with Census data.

The LEAIC file also allows for more detailed geographic breakdowns of crime data. For example, FBI data do not include codes for cities and townships; the smallest geographic unit available is the county. Census data, however, include place-level identifiers. By linking FBI crime data with Census data using the LEAIC file, researchers are able to link crime data to sub-county localities. 

The new NACJD learning guide shows users how to access the LEAIC file and use it to merge data from the National Incident Based Reporting System (NIBRS) and the U.S. Census. It provides step-by-step instructions and syntax (in SPSS and R) for merging the files and calculating homicide victimization rates.

The guide is available on the NACJD website here.

Apr 13, 2018

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