Documentation: Crime Data 2010
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Publisher: Interuniversity Consortium for Political and Social Research (ICPSR)
Survey: Crime Data 2010
Document: Uniform Crime Reporting Program Data: County-Level Detailed Arrest and Offense Data, 2010
citation:
Social Explorer, United States Department of Justice. Office of Justice Programs. Federal Bureau of Investigation. Uniform Crime Reporting Program Data: County-Level Detailed Arrest and Offense Data, 2010. ICPSR33523-v1.
Uniform Crime Reporting Program Data: County-Level Detailed Arrest and Offense Data, 2010
Break in Series
Two major changes to the UCR county-level files were implemented with the 1994 data and are continued through the 2010 data. A new imputation algorithm to adjust for incomplete reporting by individual law enforcement jurisdictions has been adopted. Also, a new Coverage Indicator has been created to provide users with a diagnostic measure of aggregated data quality in a particular county. These developments are described in greater detail below. The changes were instituted in response to comments from a number of users and after almost a year of discussions by UCR file users, the FBI, the Bureau of Justice Statistics, and the Inter-university Consortium for Political and Social Research. These changes result in a break in series from previous UCR county-level files. Data from earlier year files should not be compared to data from 1994 and subsequent years. Changes in procedures used to adjust for incomplete reporting at the ORI or jurisdiction level may be expected to have an impact on aggregates for counties in which some ORIs have not reported for all 12 months. However, the new adjustment procedures should result in county-level data that are less sensitive to changes between years in the extent of reporting by ORIs within a county. Consequently, data from 1994 forward should be more accurate estimates for longitudinal analysis.

CHANGES IN IMPUTATION PROCEDURES FOR INCOMPLETE REPORTING IMPUTATION PROCEDURES USED FOR 1977-1993 UCR COUNTY-LEVEL FILES:

The data for any ORI reporting 12 months were used for county aggregation as submitted. Data for an ORI reporting six to 11 months were increased by a weight of [12/months reported]. Data for any ORI reporting less than 6 months were deleted from the county total, and the population served by that ORI was deleted from the county population total to help control for differential data quality across counties.


The aim of this procedure was to produce comparable data cross-sectionally across all counties. However, if there were major changes in the ORIs that reported in a county across years, artifactual changes in the longitudinal data for a county could be introduced because of potential variation in the type of ORIs used to compute imputed county totals and rates each year.

IMPUTATION PROCEDURES USED FOR 1994 UCR COUNTY-LEVEL FILES AND ONWARD:

The data for any ORI reporting 12 months were used for county aggregation as submitted. Data for an ORI reporting 3 to 11 months were increased by a weight of [12/months reported]. For ORIs reporting 0 to 2 months in the arrest files or 1 to 2 months in the crimes reported files, data for these ORIs were set to zero and then data were estimated using rates calculated from ORIs reporting 12 months of data located in the ORI's geographic stratum based on UCR Population Groups within their state. UCR Population Groups are defined as follows:


Population Group
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1) Cities 250,000 and over
2) Cities 100,000 - 249,999
3) Cities 50,000 - 99,999
4) Cities 25,000 - 49,999
5) Cities 10,000 - 24,999
6) Cities 2,500 - 9,999
7) Cities under 2,500
8) Non-MSA counties and non-MSA State Police
9) MSA counties and MSA State Police


There is an important distinction in estimation procedures for the arrest versus the crimes reported files. For the arrest files (Parts 1-3 and 5-7), data were estimated for agencies reporting 0-2 months based on the procedures mentioned above. However, due to the structure of the original data received from the FBI, ICPSR was only able to estimate data for agencies reporting 1-2 months in the crimes reported files (Parts 4 and 8). No estimations are provided for agencies reporting 0 months. To assist users, the county population figures and number of agencies reporting for both the arrest and crimes reported data files were added to the crimes reported files.


These variables provide users with information that can be used to determine the proportion of the population or agencies not included in the crime reported files due to the absence of records for agencies reporting 0 months. Users should keep in mind these differences when doing their analyses.