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Crime statistics refer to systematic, quantitative results about crime, as opposed to crime news or anecdotes. Notably, crime statistics can be the result of two rather different processes:
However, in their research, criminologists often draw on official figures as well. [1]
There are several methods for the measuring of crime. Public surveys are occasionally conducted to estimate the amount of crime that has not been reported to police.[ citation needed ] Such surveys are usually more reliable for assessing trends.[ citation needed ] However, they also have their limitations and generally don't procure statistics useful for local crime prevention, often ignore offenses against children and do not count offenders brought before the criminal justice system.[ citation needed ]
Law enforcement agencies in some countries offer compilations of statistics for various types of crime.[ citation needed ]
There are three major methods for collecting crime data:
For less frequent crimes such as intentional homicide and armed robbery, reported incidents are generally more reliable, but suffer from under-recording; for example, no criming in the United Kingdom sees over one third of reported violent crimes being not recorded by the police. [2] Because laws and practices vary between jurisdictions, comparing crime statistics between and even within countries can be difficult: typically only violent deaths (homicide or manslaughter) can reliably be compared, due to consistent and high reporting and relative clear definition.[ citation needed ]
The U.S. has two major data collection programs, the Uniform Crime Reports from the FBI and the National Crime Victimization Survey from the Bureau of Justice Statistics.[ citation needed ] However, the U.S. has no comprehensive infrastructure to monitor crime trends and report the information to related parties such as law enforcement. [3] [4] [5]
Research using a series of victim surveys in 18 countries of the European Union, funded by the European Commission, has reported (2005) that the level of crime in Europe has fallen back to the levels of 1990, and notes that levels of common crime have shown declining trends in the U.S., Canada, Australia and other industrialized countries as well.[ citation needed ] The European researchers say a general consensus identifies demographic change as the leading cause for this international trend.[ citation needed ] Although homicide and robbery rates rose in the U.S. in the 1980s, by the end of the century they had declined by 40%. [3]
However, the European research suggests that "increased use of crime prevention measures may indeed be the common factor behind the near universal decrease in overall levels of crime in the Western world", since decreases have been most pronounced in property crime and less so, if at all, in contact crimes. [6] [7] [8]
Relatively few standards exist[ clarification needed ] and none that permit international comparability beyond a very limited range of offences[ clarification needed ].[ citation needed ] However, many jurisdictions[ clarification needed ] accept the following[ citation needed ]:
Offending that is a breach of the law but for which no punishment exists is often not counted.[ citation needed ] For example: Suicide, which is technically illegal in most countries, may not be counted as a crime, although attempted suicide and assisting suicide are.[ citation needed ]
Also traffic offending and other minor offending that might be dealt with by using fines rather than imprisonment, is often not counted as crime.[ citation needed ] However separate statistics may be kept for this sort of offending.[ citation needed ]
Because of the difficulties in quantifying how much crime actually occurs, researchers generally take two approaches[ clarification needed ] to gathering statistics about crime.[ citation needed ]
However, as officers can only record crime that comes to their attention and might not record a matter as a crime if the matter is considered minor and is not perceived as a crime by the officer concerned.[ citation needed ]
For example, when faced with a domestic violence dispute between a couple, a law enforcement officer may decide it is far less trouble to arrest the male party to the dispute, because the female may have children to care for, despite both parties being equally culpable for the dispute.[ citation needed ] This sort of pragmatic decisionmaking asked[ clarification needed ] if they are victims of crime, without needing to provide any supporting evidence.[ citation needed ] In these surveys it is the participant's perception, or opinion, that a crime occurred, or even their understanding about what constitutes a crime that is being measured.[ citation needed ] As a consequence differing methodologies may make comparisons with other surveys difficult.[ citation needed ]
These surveys also give insights as to why crime is reported, or not.[ citation needed ] The surveys show that the need to make an insurance claim, seek medical assistance, and the seriousness of an offence tend to increase the level of reporting, while the inconvenience of reporting, the involvement of intimate partners and the nature of the offending tend to decrease reporting.[ citation needed ]
These findings allow degrees of confidence to be assigned to various crime statistics.[ citation needed ] For example: Motor vehicle thefts are generally well reported because the victim may need to make the report for an insurance claim, while domestic violence, domestic child abuse and sexual offences are frequently significantly under-reported because of the intimate relationships involved, embarrassment and other factors that make it difficult for the victim to make a report.[ citation needed ]
Attempts to use victimisation surveys from different countries for international comparison has failed in the past.[ citation needed ] A standardised survey project called the International Crime Victims Survey[ clarification needed ] [10] Results from this project have been briefly discussed earlier in this article. In 2019, the Global Organized Crime Index found that DRC had the highest rate of criminality. [11] [12]
Annual estimates of crimes committed in the United States range from eleven to thirty million because many acts go unreported. [13] [14] [15]
An estimated hundred million Americans have a criminal record. [16] [17]
While most jurisdictions could probably agree about what constitutes a murder, what constitutes a homicide may be more problematic[ citation needed ], while a crime against the person could vary widely.[ citation needed ] Legislation differences often mean the ingredients of offences vary between jurisdictions.[ citation needed ]
The International Crime Victims Survey has been done in over 70 countries to date and has been a 'de facto' standard for defining common crimes.[ citation needed ] Complete list of countries [18] participating and the 11 defined crimes [19] can be found at the project web site. [20]
In March 2015 the UNODC published the first version of the "International Classification of Crime for Statistical Purposes" (ICCS). [21] According to the UNODC, there have been more than three million homicides in Africa since the year 2000. [22]
More complex measures[ clarification needed ] involve measuring the numbers of discrete victims and offenders as well as repeat victimisation rates and recidivism.[ citation needed ] Repeat victimisation involves measuring how often the same victim is subjected to a repeat occurrence of an offence, often by the same offender.[ citation needed ] Repetition rate measures are often used to assess the effectiveness of interventions.[ citation needed ]
Other measures:
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