Measures of Crime
Three ways to measure crime
1. Crime reported to the Police
UCR Uniform Crime Report
FBI
2. Survey of Victims
NCVS National Crime Victimization Survey
Bureau of Justice Statistics
3. Survey of Offenders
Self Reports
Several agencies
I. UCR Uniform Crime Report: Crime reported to the Police
Careful with the classification of the UCR as Official Statistics in the textbook: NCVS is just as "official".
Reading assignment on the www: FBI UCR FAQ: http://www.fbi.gov/ucr/ucrquest.htm
Someone, somewhere, for some reason, believed that a crime might have been committed and reported it.
Question: How does underreporting happen?
Who is interested in low numbers?
Question: How does overreporting happen?
Who is interested in high numbers?
Example: The UCR handbook for the Police is designed to achieve the highest crime rate possible:
"If a number of persons are involved in a dispute or disturbance and a police investigation cannot establish aggressors from the victims, count the number of persons assaulted as the number of offenses"(UCR Police Handbook).
A) Nixon Example
He wanted to demonstrate that crime decreased under his legislation.
Theft was simply listed for theft above $50 (Seidman & Couzens 1974).
B) Conjoin minor assaults with assaults. Number of violent crime goes up.
Categories for forcible rape were merged in the UCR. Now it includes "assaults or attempts to commit rape by force or threat of force" see: http://www.fbi.gov/publish.htm
A) No squad car will be detached for a crime report (New York City). People have to come to the station (Tallahassee).
B) Creating social awareness that certain crimes should be reported
Rape crisis Hotline
Homework: check the UCS on the www. Links are provided on our updated homepage.
II. National Crime Victimization Survey (NCVS): Survey of Victims
What allows statistics of both agencies (FBI and Bureau of Justice Statistics) to be compared?
Check the FBI's own account how both compare on the WWW at:
http://www.ojp.usdoj.gov/bjs/pub/ascii/ntmc.txt
Summary at http://www.ojp.usdoj.gov/bjs/abstract/cv94.htm
Check for trends in the 1996 study : http://www.ojp.usdoj.gov/bjs/abstract/cv96.htm
Rough Comparison of the UCR and NCVS
| Uniform Crime Reports UCR | National Crime Victimization Survey NCVS |
| FBI | Department of Justice
Bureau of Justice Statistics |
| since 1940s | since 1970s |
| crimes reported to the police
crimes cleared by arrest age, gender race of offender |
crimes reported by victims
sociodemographics of victims |
| police files | household surveys |
| Rape
Robbery Assault Burglary Larceny Vehicle theft + murder + arson |
Rape
Robbery Assault Burglary Larceny Vehicle theft |
| Bonus: crimes reported
crimes cleared |
Bonus: demographic description of the victim |
Example of an exam question:
What allows statistics of the National Crime Survey (NCS) to be compared to the statistics in Uniform Crime Reports (UCR).
a) the exact measurement of crime in the UCR
b) the exact measurement of crime in the NCS
c) the fact that the categories for crimes sampled in both studies are largely identical
d) the fact that UCR reflects crime reported to the police
e) the fact that NCS reflects crime reported by victims
Third Party Self Report Studies
What can be different in a Third Party Self Report Study as compared to the National Crime Victimization Survey?
Disclaimer: The documents linked to other sources on the WWW, others than http://www2.tltc.ttu.edu/Schneider2/ and its subdirectories, do not necessarily express the views of Texas Tech University or Dr. Andreas Schneider. @Copyright 2006 Andreas Schneider