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Effects of NIBRS on Crime
Statistics
Compares data from
Federal Bureau of Investigation Summary Uniform Crime Reports and National
Incident-Based Reporting System (NIBRS) for 1,131 agencies. Using data
from 1991 to 1996, this study identifies which Index crime rates are most
affected by NIBRS reporting and examines the extent to which rates change.
The following underlying causes for these differences are investigated:
- structural differences
- non-uniform reporting
practices
- reporting errors
- software coding
errors
When comparing data from the same year for the jurisdictions in this
study, NIBRS rates differ only slightly from Summary UCR -
- Murder rates
are the same
- Rape, robbery,
and aggravated assault rates in NIBRS are about 1% higher,
on average, than in Summary UCR
- NIBRS burglary
rates are lower by an average 0.5%
- NIBRS larceny
rates are higher by an average 3.4%
- NIBRS motor vehicle
theft rates are higher by an average 4.5%
7/00 NCJ 178890
Acrobat
file (197K) | ASCII
file (45K)
Spreadsheets
(zip format) (26K)
About
the source data | Codebooks
& data sets
To
order paper version
Slide presentation of the
results of this study presented at the NIBRS regional focus group meetings,
Acrobat file (51K)
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