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Unformatted text preview: Self Report Data – Clearance rate – compares the number of rimes reported to the number of crimes solved by arrest or by other means On average 50% of all index crimes are reported to the police • 26% of thefts • 50% of burglaries • 45% of rapes • 57% of robberies • Victims may not report crime State law definitions may be different than UCR definitions Systematic errors in reporting hierarchy rule Deliberate alteration Ignores a lot of criminal activity o Why crime went down in the 1990s Demographics – baby boomers Drug market stabilization Unemployment decreased so more people working Improvements in criminal justice o The new UCR (NIBRS) Uses incident based not summary based reporting Expands data collected • More victim offender data • More circumstance Expands offense reporting • 22 offenses • Distinguish attempts Does not use hierarchy rule...
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- Fall '08
- UCR crime index, Crime Official Data