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1 Patsy Klaus, Measuring Crime 1 (1981)

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    U.S. Department of Justice
-{ Bureau of Justice Statistics


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Measuring Crime


   We have all grown accustomed to seeing
reports about crime rates in the newspapers
and on television. But where do these
statistics come from? Most probably they
are a count of the number of crimes
reported to local law enforcement agencies
and sent to the Uniform Crime Reports
(UCR) program. The UCR program has been
developing national statistics on crime from
local police records since 1930. These
statistics are published annually in Crime in
the United States and receive much
attention in the media because of the
concern each of us has about crime and its
effect on our lives.
   You may have also seen articles that
present statistics on victims of crime and
discuss victimization rates for the
United States. These statistics come not
from police agencies but directly from the
victims themselves and provide another way
of looking at crime and its consequences.
Since 1973,victimization data have been
collected from households across the Nation
through the National Crime Survey (NCS).
Both programs, the UCR operated by the
FBI and the NCS operated by the Bureau of
Justice Statistics, are located within the
Department of Justice.
   Using two programs to measure crime is
not redundant. The National Crime Survey
was developed in response to the growing
recognition that police statistics, for all
their importance, have inherent limitations.
The most obvious is that police cannot
report crimes that do not come to their
attention. Crime victims, however, can
describe what happened to them, whether
they have reported the crime to the police
or not. On the other hand, obtaining
separate crime statistics for the thousands
of local communities across the country
through a victimization survey is imprac-
tical because it would require almost a
complete census costing billions. This kind
of geographical detail is available through
the Uniform Crime Reports. Thus, the
National Crime Survey and the Uniform
Crime Reports both supplement and
complement each other in ways that
enhance our understanding of crime.

Crimes measured
  Seven crimes were originally designated,
on the basis of their seriousness and


    With this issue, the Bureau of Justice
  Statistics begins a monthly publication
  series of issues and facts in crime and
  justice statistics aimed at decision-
  makers. Although Bureau of Justice
  Statistics Bulletins will deal with a
  variety of topics, the intent of the series
  is to make available objective
  information, in nontechnical language,
  about the state of the Nation with
  respect to its problems of crime and the
  administration of justice. The Bureau
  welcomes comment on the Bulletins,
  particularly suggestions for topics to be
  treated. All inquiries should be sent to
  the Director, Bureau of Justice
  Statistics, Washington, D.C. 20531.
                 Harry A. Scarr
                 Director


frequency, to compose the Uniform Crime
Reports Crime Index.1 They are murder
and nonnegligent manslaughter, forcible
rape, robbery, aggravated assault, burglay,
larceny-theft, and motor vehicle theft.
Arson was added to the Crime Index by
congressional mandate in 1978. These
crimes are known as the index offenses but
are often called Part I crimes because at
one time they were reported to the FBI in
the first part of a two-part reporting
form.2 The Crime Index is a single
number obtained by adding together all the
incidents of each of these crimes. Its
year-to-year fluctuations have been used to
measure trends in the volume of crime.
  If more than one index offense occurs
during a, single incident, only the most
serious is reported in the UCR program and
included in the Crime Index total. The
seriousness of index offenses is shown by the
order in which they are listed above. For
example, if a man breaks into a house,

  1Uniform Crime Reporting Handbook, Federal
Bureau of Investigation, U.S. Department of Justice,
p.2.
  2Although the terms Part I and Crime Index
are often used interchangeably, they are not
identical Part I crimes include negligent
manslaughter; the Crime Index does not. Partl
crimes are, in general, less serious crimes for which
only arrest data are reported.


encounters a woman whom he rapes and robs
at gunpoint, and then steals her car to make
his getaway, he has committed the index
offenses of burglary, forcible rape, robbery,
and motor vehicle theft. Only the highest
ranking offense, the rape, is reported to the
UCR program and included in the Crime
Index total. Arson is the only index offense
for which this rule does not apply; that is, an
arson is always reported even if other index
offenses occur during the same incident.
Similarly, the National Crime Survey
classifies each incident by the most serious
offense that occurred, using a seriousness
ranking corresponding to that for UCR index
offenses. Information on other offenses
that occurred at the same time, however, is
collected in the NCS and presented in some
reports.
  Six crimes are measured in the National
Crime Survey: rape, robbery, assault
household burglary, personal and household
larceny, and motor vehicle thefL The
similarity between these crimes and the
UCR Index crimes is intentional and is even
closer than may first appear. Of the two
crimes totally missing from the National
Crime Survey, murder cannot be measured
through surveys of victims because
obviously the victim is dead, and arson
cannot be measured well through such
surveys because the presumed victim (the
property owner) may in fact be the
perpetrator, particularly if collection of
insurance is the motive for the crime.
Professional expertise is often needed to
determine that a suspicious fire is indeed
arson and therefore a crime, another factor
complicating its measurement. Both UCR
and NCS count as crimes all attempts as
well as successfully completed crimes. The
NCS collects these separately so that totals
are available for both actual offenses and
attempted offenses, whereas the UCR does
not.
  Rape (N CS) and forcible rape (UCR) are
defined in the same manner in both series.
Both involve force or the threat of force.
The term forcible in the UCR is used in
contrast to statutory rape where sexual
union is consensual but the female is under
the legal age of consent. Neither NCS nor
  3From 1973 through 1976 robberies and
  burglaries of business establishments were also
  measured in the National Crime Survey.

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