Study 1
Bryant and colleagues (2015) compared trends in crime and automobile accidents over a 6-year period (3 years prior to the Data-Driven Approaches to Crime and Traffic Safety (DDACTS) policy change and 3 years following the DDACTS policy change) in target and comparison areas in Shawnee, Kansas. The DDACTS “hot spot” area was determined through the co-analysis of crime and traffic accident data. The DDACTS area comprised 2 percent of the city’s total land area and 7.5 percent of its population, but accounted for 10.3 percent of the city’s Part 1 violent crimes and a disproportionate number of traffic accidents. The comparison area was selected because it was similar to the DDACTS area in terms of space, land use, and crime.
DDACTS was initiated on July 6, 2010. The pre-implementation period lasted between July 6, 2007, and July 5, 2010. The post-implementation period lasted between July 6, 2010, and July 5, 2013. The researchers conducted analyses in both the DDACTS target area and the comparison area.
Bivariate analyses and interrupted time series (ITS) analysis were conducted to determine the impact of the DDACTS model on robberies, commercial and residential burglaries, and vehicle collisions.
Study 2
Bryant and colleagues (2014) conducted a pre- and posttest comparison of means with two comparison groups to determine the effects of the DDACTS initiative on crimes and automobile collisions in the target zone of Shawnee, Kansas. The treatment area was the DDACTS zone (the 75th Street corridor between Switzer Road and Quivira Road); the two comparison areas were in the control zone along Shawnee Mission Parkway and the rest of Shawnee (areas not included in either the target zone or the control area).
The pretest included the 3 years of crime and traffic collision data prior to the implementation of DDACTS on July 6, 2010. The posttest included the 3 years of crime and traffic collision data after the implementation of DDACTS on July 6, 2010. The researchers extracted, cleaned, and analyzed data from the police records management system (PRMS), using the Automated Tactical Analysis of Crime (ATAC) Workstation software. The outcomes of interest were total target crimes, which included auto burglary, auto theft, robbery, and total vehicle collisions (including collisions with and without injuries).