The Geography, Incidence, and Underreporting of Gun Violence: New Evidence Using Shotspotter Data

17 Pages Posted: 28 Apr 2016

See all articles by Jillian Carr

Jillian Carr

Purdue University - Krannert School of Management

Jennifer L. Doleac

Texas A&M University - Department of Economics

Date Written: April 26, 2016

Abstract

This paper provides new evidence on the extent of underreporting of gun violence. Criminal activity is often selectively underreported – that is, underreported in a non-random manner. This can make it difficult to understand public safety problems and devise effective policy strategies to address them. However, new surveillance technologies are facilitating the collection of more accurate data on crime. In this paper, we describe data on gunfire incidents, recorded using a tool called ShotSpotter. We compare those data with previously-available data on gun violence (reported crime and 911 calls) to estimate baseline correlations between these measures as well as the causal effect of gunfire incidents on reporting. Using data from Washington, DC, and Oakland, CA, we find that only 12% of gunfire incidents result in a 911 call to report gunshots, and only 2-7% of incidents result in a reported assault with a dangerous weapon. These extremely low reporting rates have important implications for research on gun violence. The characteristics and research potential of ShotSpotter data are relevant to surveillance data more broadly; while such data have not yet been exploited by social scientists, they could be extremely valuable for crime research and policy.

Keywords: ShotSpotter, gun violence, gunfire, sensor data, surveillance, technology, underreporting

JEL Classification: K42, C81

Suggested Citation

Carr, Jillian and Doleac, Jennifer L., The Geography, Incidence, and Underreporting of Gun Violence: New Evidence Using Shotspotter Data (April 26, 2016). Available at SSRN: https://ssrn.com/abstract=2770506 or http://dx.doi.org/10.2139/ssrn.2770506

Jillian Carr

Purdue University - Krannert School of Management ( email )

1310 Krannert Building
West Lafayette, IN 47907-1310
United States

Jennifer L. Doleac (Contact Author)

Texas A&M University - Department of Economics ( email )

5201 University Blvd.
College Station, TX 77843-4228
United States

HOME PAGE: http://jenniferdoleac.com/

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