Crime Dimension
Category A Victim Crime Index
- The rate of category A victim crime in each NSA as
compared with the rate of category A victim crime in the City of Chesapeake.
The address locations of each category A victim crime offenses in 2012 were address-matched
using GIS. For the purpose of this study, category A victim crimes include homicides, rapes,
robberies and aggravated assaults. The point data was then assigned to NSAs to get the total
number of crimes per NSA. The total number of category A victim crimes was also summed for
the City of Chesapeake.
The population of each NSA and the City of Chesapeake was calculated from census block
group statistics. The number of category A victim crime incidents for each NSA was divided by
the population of each NSA to get the rate of category A victim crime. The total number of
category A crime incidents for the City of Chesapeake was divided by the population of
Chesapeake to get the citywide rate of category A victim crime. The category A victim crime
rate for each NSA was then compared to the city rate.
The Location Quotient method was used for the comparison. The results indicate the share of all
category A victim crime in the City of Chesapeake captured by the individual NSA. For instance,
a score of 1.00 indicates that the particular NSA has a rate of category A victim crime that equals
the city rate.
Sources: Chesapeake Police Department, 2012.
U.S. Census Bureau, 2010 Census.
Category A Non-Victim Crime Index
- The rate of category A non-victim crime in each NSA
as compared with the rate of category A non-victim crime in the City of Chesapeake.
The street block locations of category A non-victim crime offenses in 2012 were address-
matched using GIS. For the purpose of this study, category A non-victim crimes include
burglaries, larcenies, vehicle thefts, arsons and vandalisms. The point data was then intersected
with all NSAs to get the total number of crimes per NSA. The total number of category A non-
victim crimes was also summed for the City of Chesapeake.
The population of each NSA and the City of Chesapeake was calculated from census block
group statistics. The number of category A non-victim crime incidents for each NSA was divided
by the population of each NSA to get the rate of category A non-victim crime. The total number
of category A non-victim crime incidents for the City of Chesapeake was divided by the
population of Chesapeake to get the citywide rate of category A non-victim crime. The rate of
category A non-victim crime per population for each NSA was then compared to the rate of
category A non-victim crime per population for the city.
The Location Quotient method was used for the comparison. The results indicates the share of all
category A non-victim crimes in the City of Chesapeake captured by the individual NSA. For
November 2014
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