What is the purpose of this course?
Is crime going up or down?
Explain the dispersion of crime in Denmark?
What are the 3 primary measures of crime volume?
Explain Official Crime Data?
Crimes reported or otherwise known to police Arrests Prosecutions Convictions Prison admittances
What is Index Crime?
USA categorizes crime as Part I and Part II Index Crime.
Results published in UCR
When people are talking about statistics about crime rising and falling, they mean this Part I category
What is Robbery?
Taking Something by use of threat or forc
What is Aggravated Assault?
Involves serious violence
What is burglary?
going into someone’s house with the purpose of stealing
What crimes are people recording, in Crime Rates, in US, UK AND DENMARK?
US - Part I index offenses
England - 100 notifiable offences (offences much broader and more serious
Denmark - Penal code offences, roughly 60 offences
How does population effect crime rates?
In 2012 there were: 515 murders in NYC and 88 in Washington
NYC has much larger population, and is safer
What are 3 types of crime rates?
Incidence (Crime) Rate in a jurisdiction (I):
- Crimes/(population/100,000)
Prevalence of offending in a population (P):
- Offenders/population, i.e., % of the population
Lambda (λ):
- Average frequency of offending per active offender
- Crimes/active offenders
- How frequently they are doing it
What are Problems with Official Crime Data?
What is the crime funnel in the US?
All offenses (100%) Reported to police (50%) Recorded by police (48%) Arrest made (14%) Prosecuted (3%) Resulting in conviction (2%) Imprisonment (1%)
What is the ”Dark figure of crime”?
crimes unreported to the police
What are reasons for not reporting?
Victim considers it too trivial
Victim feels the police will not be able to do anything about it
Victim feels the police will not be willing to do anything about it
- The police are uninterested
- The police won’t believe them
- The police are too busy
The matter is embarrassing or compromising
Victim is scared to report it
Victim would prefer to deal with the matter in another way
Reasons for non-recording by the police?
What is the clearance rate?
Explain Victimization Surveys
Problems with Victim Surveys
Only as good as the (random, representative) sample
Under-estimation
Over-estimation
What are the major victimization surveys?
National
International
Explain Measures of Crime Volume: 3. Emergency Room (ER) Admittances
Problems with Emergency Room Data