MEASURE OF CRIME
figure of crime, Crime Control Model, Crime Reduction
How do we measure crime?
Do we rely on police records, do we find the number of people incarcerated, or do we use a
victimization survey? Whatever the tool used for
measure of crime, it must be asked: Is this measurement reliable? Is it valid?
"Over the past 20 years one
measure of crime (the NCVS) has decreased by 26% and the other measure (the UCR) has
increased about 47%, and the imprisonment rate has increased by 200%."
How is crime measured?
Street crime is measured in two main ways in the U.S.
One is Uniform Crime Report (UCR):
This is computed by adding together the major crimes that are reported to the police who
in turn report to the F.B.I. who in turn publish the findings.
Another measure of crime comes
from the National Crime Victimisation Survey (NCVS). About 20 years ago it became clear
that only a proportion of crimes are actually reported to the police and that if we wanted
a more accurate count, we would have to conduct scientific surveys of the population and
ask people if they had been victims of crime. This is what the National Crime
Victimization Survey (NCVS) does.
Since the UCR and the NCVS measure
crime in different ways, they present different views of crime. The UCR only contains
crimes that are reported to the police, by some estimates only 40% of the total. On the
other hand, the NCVS does not include the crime murder nor crimes for which there is no
reporting victim, like most drug-related crimes. Also not included are all white collar
crimes, like the savings and loan frauds, and much more.
Murder is the easiest to measure
and thus is the crime we know most about. About 25,000 people were murdered in the U.S.
last year. The murder rate in the U.S. was about 10 (per 100,000 population) in 1930 was
about 10 in 1990 with almost no change in 60 years. Similarly, the murder rate in 1993
(9.3) was just about what it was in 1973 (9.4).
Determining rates of crime
(generally, per 1000 people or 100,000 people) requires that the number of offenses (the
numerator) be divided by an accurate count of the population (the denominator). The
results of the decennial United States Census are conventionally used as the sources of
Metropolitan Structure and Violent
Crime: Which Measure of Crime?, by Robert M. O'Brien.
Getting the Measure of Crime. What practical problems does the criminologist face in going
about his business?
The British Crime Survey is
regarded as the most reliable measure of crime by the Home Office. The stated aims of the
BCS are as follows:
to provide an alternative measure of crime to that which is recorded by the police in the
form of official crime figures
to provide information on crime risks and inform crime prevention programmes
to record public attitudes to crime, fear of crime, and measures taken to avoid it
to record attitudes towards the criminal justice system
(The British Crime Survey, said
the risk had risen one percentage point to 24.3%.
In a separate measure of crime, the number of crimes reported to police had fallen 3% in
the third quarter of 2006 compared with the same period the previous year.)
We need to assess the sensitivity
of the findings when the measure of crime is completely dependent on the survey.
Victim surveys as an alternative measure of crime - Doing Research on Crime and Justice By
Roy D. King,
"Crimes known to the police" has the most value of all official measures of
crime because it is closest procedurally to the actual crime committed, probably as close
as an official crime statistic will ever be. Even so, as with each and every measure and
crime statistic, there are problems regarding even this best of official crime statistics.
- (Thorsten Sellin)
If there is a constant ratio
between the actual amount of crime (including the dark figure of unknown offenses) and
officially recorded crime, whether recorded by arrest, prosecution, conviction, or
imprisonment, then the latter is "representative" of the former and acceptable
as a measure of crime. During the nineteenth century and through the first quarter of the
twentieth century, scholars and practitioners alike generally operated under this
assumption in using and defending judicial statistics as the true measure of crime in a
Statisticians use lists of reported offences as measure of crime. Respondents are asked to
check one or more offenses from a list of fifty that they might have committed over the
preceding year. But this approach gives equal weight to an admission of marijuana
possession, driving while drunk, stealing and assault with intent to kill.
European countries that had developed national reporting systems of judicial statistics
did not include police statistics, particularly crimes known, until the 1950s, and
ironically, Great Britain did not acknowledge that crimes known to the police was a valid
measure of crime until the mid-1930s, although these data had been collected since the
mid-nineteenth century (Sellin and Wolfgang).
There are drawbacks to using arrest data as a measure of crime. Arrest statistics do not
reflect the number of different people arrested each year because an unknown number of
people may be arrested more than once in a year. Arrests depend on various factors and
Analyzing Multiple-Item Measures of Crime and Deviance I: Item Response Theory
Scaling - Journal Journal of Quantitative Criminology
D. Wayne Osgood , Barbara J. McMorris and Maria T. Potenza
Abstract Multiple-item measures of self-reported offending typically provide the principal
outcome measures for individual level research on the causes of crime and deviance. This
article directs attention to the substantial problems presented by the task of forming
composite scores for these measures, and it presents a possible solution to those
problems. We consider scaling by means of the graded response model from item response
theory (IRT) as a potential means of overcoming the shortcomings of traditional summative
scaling and of obtaining valuable information about the strengths and weaknesses of our
measures. We illustrate this strategy through a scale analysis of a fourteen-item,
self-report measure of delinquency, using three years of data from the Monitoring the
Future study. The graded response model proves to be consistent with the data, and it
provides results that address important substantive questions about self-report study measures. The findings are
informative about the strengths and weaknesses of alternative strategies for developing
self-report instruments, indicating that there is little to be gained by making fine
distinctions in the frequency of individual delinquent acts.
A review and analysis of Crime Control Strategies: An Introduction to the Study of
- (New York: Oxford University Press, 1980) by Harold E. Pepinsky.
Journal Law and Human Behavior
In this review we have tried to formulate explicitly several important concepts presented
in Crime Control Strategies: An Introduction to the Study of Crime by Harold E. Pepinsky.
This primarily involved discussion of the definitions of crime and criminality and the meaning of the systemic and emperical approach. Specifically, we
pointed out the behavioral and sociopolitical components of the definitions of crime and
criminality and, by implication, their various measures. The systems approach has been
proposed as a rigorous method for decomposing these measures. We have argued that
empirical models or systems can be developed to disaggregate measures of crime and
criminality into their causal components toward the end of rationally devising,
administering and evaluating social control strategies.
"Offenses known to the police" has generally been considered the best source of
official crime data. However, most of the European countries that had developed national
reporting systems of judicial statistics did not include police statistics, particularly
crimes known, until the 1950s, and ironically, Great Britain did not acknowledge that
crimes known to the police was a valid measure of crime until the mid-1930s, although
these data had been collected since the mid-nineteenth century (Sellin and Wolfgang).
Murder stats no measure of crime
NALINEE SEELAL Wednesday, November 15 2006
MINISTER in the Ministry of National Security Fitzgerald Hinds yesterday said the murder
rate (which as of yesterday stood at 328) will not be used as a yardstick to determine if
crime is on the increase or decrease.
Social Production of Crime
Data: A Critical Examination of Chinese Crime Statistics
Ni He, Ineke H. Marshall
The primary focus of this article is a critical examination of Chinese crime statistics.
The problems related to the production as well as the comparative use of Chinese national
crime statistics are tackled by means of an organizing framework that includes macro-level
characteristics of Chinese society, factors that affect the quality and quantity of
Chinese crime statistics, and specific problems related to the comparative use of Chinese
crime statistics. It is argued that Chinese crime statistics are suspect as a measure of
crime, more so than in Western countries, but that they nevertheless can be quite useful
when applied as a measure of crime of organizational processes reflecting social control.
Re-examining social disorganization theory using calls to the police as a measure
Warner, B.D., Pierce, G.L., Journal:Criminology
Scottish Crime Survey, 2000
Abstract: The Scottish Crime Survey (SCS) (from 2004, the Scottish Crime and Victimisation
Survey (SCVS) - see below) is a repeat cross-sectional survey measuring the incidence and
prevalence of victimisation among the Scottish population. The survey aims to provide an
alternative measure of crime to the police recorded crime statistics, examine trends in
the level and nature of crime over time, assess varying crime risks and collect
information on a range of other crime-related issues, e.g. concern about crime; attitudes
to the police; drug misuse and domestic violence. The name of the survey was changed in
2004 to better reflect its content.