Southern California Crime Study

In the Southern California Crime Study (SCCS), the researchers made an effort to contact each police agency in the Southern California region and request address-level incident crime data for the years 2005-2012. Many of the agencies were willing to share their data with us. As a consequence, we have crime data for 2,740 of the 3,852 tracts in the region, which cover 219 of the 341 cities and 83.3 percent of the region’s population.

Further information

. The data come from crime reports officially coded and reported by the police departments. We classified crime events into six Uniform Crime Report (UCR) categories: homicide, aggravated assault, robbery, burglary, motor vehicle theft, and larceny. Crime events were geocoded for each city separately to latitude–longitude point locations using ArcGIS 10.2, and subsequently aggregated to various units such as blocks, block groups, and census tracts. The average geocoding match rate was 97.2% across the cities, with the lowest value at 91.4%. These data have been used in several prior studies (Kubrin and Hipp 2016; Hipp and Kubrin Forthcoming).

In 2010:

  • Of 270,095 blocks, we have crime data for 208,091 (77.04%)
  • We have crime data covering population of 16,779,884 out of 20,149,002 total (83.28%)
  • 128,125 blocks have crime data in all years covering 11,122,770 population (55.2% of total population)
  • 150,341 blocks have crime data in all years but one, covering 12,442,179 population (61.75% of total population)
  • Blocks and population and % of population in each year
    • 2005 – 147,418 12,137,229  24%
    • 2006 – 150,572 12,486,132  97%
    • 2007 – 196,556 15,882,037  82%
    • 2008 – 198,964 16,056,494  69%
    • 2009 – 199,343 16,107,650  94%
    • 2010 – 201,427 16,321,666  00%
    • 2011 – 202,397 16,375,419  27%

2012 – 185,058  15,421,899  76.54%