Crime data comparison

As the administration takes steps to address violence in American communities, here are five facts about crime in the United States. For both studies, is the most recent full year of data. The BJS figures do not show an increase in the violent crime rate between andbut they do not count murders.

Crime data comparison

Crime data comparison much as their different collection methods permit, the two measure the same subset of serious crimes, defined alike.

Both programs cover rape, robbery, aggravated assault, burglary, theft, and motor vehicle Crime data comparison. There are also significant differences between the two programs.

First, the two programs were created to serve different purposes. The BJS established the NCVS to provide previously unavailable information about crime including crime not reported to policevictims, and offenders.

Second, the two programs measure an overlapping but nonidentical set of crimes. The NCVS includes crimes both reported and not reported to law enforcement. The UCR captures crimes reported to law enforcement but collects only arrest data for simple assaults and sexual assaults other than forcible rape.

Crime Rate Comparison: Lexington Vs.

For example, the UCR defines burglary as the unlawful entry or attempted entry of a structure to commit a felony or theft. The NCVS, not wanting to ask victims to ascertain offender motives, defines burglary as the entry or attempted entry of a residence by a person who had no right to be there.

Fourth, for property crimes burglary, theft, and motor vehicle theftthe two programs calculate crime rates using different bases. The UCR rates for these crimes are per capita number of crimes perpersonswhereas the NCVS rates for these crimes are per household number of crimes per 1, households.

Because the number of households may not grow at the same rate each year as the total population, trend data for rates of property crimes measured by the two programs may not be comparable.

In addition, some differences in the data from the two programs may result from sampling variation in the NCVS and from estimating for nonresponse in the UCR.

The BJS uses rigorous statistical methods to calculate confidence intervals around all survey estimates. The BJS describes trend data in the NCVS reports as genuine only if there is at least a percent certainty that the measured changes are not the result of sampling variation.

The UCR Program bases its data on the actual counts of offenses reported by law enforcement agencies. In some circumstances, the UCR Program estimates its data for nonparticipating agencies or those reporting partial data.


Apparent discrepancies between statistics from the two programs can usually be accounted for by their definitional and procedural differences or resolved by comparing NCVS sampling variations confidence intervals of those crimes said to have been reported to police with UCR statistics. For most types of crimes measured by both the UCR and NCVS, analysts familiar with the programs can exclude from analysis those aspects of crime not common to both.

Resulting long-term trend lines can be brought into close concordance. The impact of such adjustments is most striking for robbery, burglary, and motor vehicle theft, whose definitions most closely coincide.

It is also possible to remove UCR robberies of commercial establishments such as gas stations, convenience stores, and banks from analysis.

Crime data comparison

When users compare the resulting NCVS police-reported robbery rates and the UCR noncommercial robbery rates, the results reveal closely corresponding long-term trends. Each program has unique strengths. The UCR provides a measure of the number of crimes reported to law enforcement agencies throughout the country.

The NCVS is the primary source of information on the characteristics of criminal victimization and on the number and types of crimes not reported to law enforcement authorities. By understanding the strengths and limitations of each program, it is possible to use the UCR and NCVS to achieve a greater understanding of crime trends and the nature of crime in the United States.

For example, changes in police procedures, shifting attitudes towards crime and police, and other societal changes can affect the extent to which people report and law enforcement agencies record crime.The Uniform Crime Reporting (UCR) is a program designed by the International Association of Chiefs of Police in , with the goal of developing a set of statistics of uniform crime, to be used by policymakers and police.4/4(1).

Whether viewing crime rates in two cities such as Pittsburgh and Philadelphia or Dallas and Austin, data obtained from the Uniform Crime Report has been essential in determining what areas of the United States are affected by more or less crime than others since its creation in This week in class we were asked to choose two metropolitan areas with different data and write a paper comparing the occurrence of the offense in the selected areas.

Crime data comparison

Baton Rouge crime incidents for the year grouped by crime type and displayed as a pie graph. The Colorado Uniform Crime Reporting Program (UCR) is a statewide, cooperative statistical effort of county, state, university and college law enforcement agencies (LEAs) reporting data on offenses, arrests, and recovered property.

The incident-based reporting (IBR) of criminal offenses or incidents is a data collection strategy that differs markedly from the Federal Bureau of Investigation’s traditional summary-based Uniform Crime Reporting (UCR) Program.

City Profiles Reports - Find City Stats & Information |