Understanding the Criminal Justice System CJUS 101 Chapter 3: Criminal Statistics and the Measurement of Crime
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
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%
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
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
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
Statistics - random survey - 50,000 households - questionnaire if victim of crime b. Self-report surveys - 100,000 households - questionnaire if committed crime