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Crimes Reported: Coverage

The coverage indicator ranges from 100, indicating that all law enforcement agencies in the county reported for 12 months in the year, to 0, indicating that all data in the county are based on estimates, not reported data. The data for any agency reporting 12 months were used for county aggregation as submitted. Data for an agency reporting 3 to 11 months were increased by a weight of [12/months reported]. For agencies reporting 0 to 2 months, data for these agencies were set to zero and then data were estimated using rates calculated from agencies reporting 12 months of data located in the agencies geographic stratum based on UCR Population Groups within their state. If stratifying by group size at the state level does not result in any comparable agencies, then the stratum is based on the division or region.

UCR Population Group

  1. Cities 250,000 and over
  2. Cities 100,000 - 249,999
  3. Cities 50,000 - 99,999
  4. Cities 25,000 - 49,999
  5. Cities 10,000 - 24,999
  6. Cities 2,500 - 9,999
  7. Cities under 2,500
  8. Non-MSA counties and non-MSA State Police
  9. MSA counties and MSA State Police

Calculation for the Coverage Indicator for counties
formula

where "agency population" are only those agencies with 3-12 months of data
      CI = coverage indicator expressed as a percent
      i = agency within county

Calculation for the Coverage Indicator for judicial districts
formula

where CI = coverage indicator
d = judicial district
c = counties within the judicial district

As a result of imputation, the number of crimes reported at the county- or judicial district-levels may differ slightly from State-level estimates when aggregated. State-level estimates actually reported should be considered authoritative in these instances.

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Page Last Modified: April 20, 2007