1. Understanding the Criminal Justice System
CJUS 101
Chapter 3: Criminal Statistics and the Measurement of Crime

2. Statistics Extent of crime - Uniform Crime Report
- nature / extent / trends
- FBI annual report
- crimes known to police
a. Crime Index: Part I offenses
- region / state / city
- 10,000 city / 25,000 county population
- universities / colleges
- crime trends

3. Statistics (1) Part I offenses: - HARRBLATA
- homicide / assault / rape / robbery
- burglary / larceny / auto theft / arson
(2) Crimes cleared
Personal crimes
- Homicide = 67.2%
- Assault = 57.3%
- Rape = 52.8%
- Robbery = 24.9%

4. Statistics Property Crimes - Burglary = 13.8%
- Larceny (theft) = 20.5%
- M/V Theft = 14.9%
- Arson = 15.7%
(3) Persons arrested
- ages / sex / race
- location of arrest

5. Statistics (4) Law enforcement personnel
- state / county / city / colleges
b. Use / misuse
- valuable in projecting costs
- also unreliable
(1) Concealment / non-reporting
- homicide most reliable
- low rape reporting
- theft / burglary: nothing can be done

6. Statistics (2) Over-reporting / underreporting - crime rate
- different reporting system
- do not report
(a) Community Oriented Policing (COP)
- not report certain crimes
Other crime reports
a. National Crime Victimization

7. Statistics - random survey - 50,000 households
- questionnaire if victim of crime
b. Self-report surveys
- 100,000 households
- questionnaire if committed crime