Crime Density in Chicago

Data for the City of Chicago comes from their Data Portal and it contains data from January 1st, 2010 until August 31, 2016.
Crimes are agregated in three broad categories according to the FBI UCR classification.

Please send comments and/or suggestions to ignaciomsarmiento at gmail.com or vist my website.

Crime Density in Denver

Data for the City of Denver comes from their Open Data Catalog and it contains data from January 1st, 2011 until December 31, 2016.
Crimes are agregated in three broad categories according to the FBI UCR classification.

Please send comments and/or suggestions to ignaciomsarmiento at gmail.com or vist my website.

Crime Density in New York

Data for the City of New York comes from their Open Data Catalog and it contains data from January 1st, 2010 until December 31, 2015.
Crimes are agregated in three broad categories according to the FBI UCR classification.

Please send comments and/or suggestions to ignaciomsarmiento at gmail.com or vist my website.

Gunfire Incidents Density in Washington D.C.

Data for Washington D.C. comes from ShotSpotter data on gunfire incidents at the Justice Tech Lab and it contains data from January, 2006 until June, 2013.
The data comes from ShotSpotter. ShotSpotter acoustic sensors detect the sound of gunfire and record the precise timestamp as well as the triangulated location of all gunfire incidents in a covered area.
References:
Carr, Jillian B., and Jennifer L. Doleac. 2017. “Keep the Kids Inside? Juvenile Curfews and Urban Gun Violence.” Accepted, Review of Economics and Statistics. Carr, Jillian B., and Jennifer L. Doleac. 2016. “The geography, incidence, and underreporting of gun violence: new evidence using ShotSpotter data.” Brookings Research Paper.

Please send comments and/or suggestions to ignaciomsarmiento at gmail.com or vist my website.

Gunfire Incidents Density in Oakland, CA

Data for Oakland comes from ShotSpotter data on gunfire incidents at the Justice Tech Lab and it contains data from January, 2008 until October, 2013.
The data comes from ShotSpotter. ShotSpotter acoustic sensors detect the sound of gunfire and record the precise timestamp as well as the triangulated location of all gunfire incidents in a covered area.
References:
Carr, Jillian B., and Jennifer L. Doleac. 2017. “Keep the Kids Inside? Juvenile Curfews and Urban Gun Violence.” Accepted, Review of Economics and Statistics. Carr, Jillian B., and Jennifer L. Doleac. 2016. “The geography, incidence, and underreporting of gun violence: new evidence using ShotSpotter data.” Brookings Research Paper.

Please send comments and/or suggestions to ignaciomsarmiento at gmail.com or vist my website.

Crime Hotspots using Density Estimation

by Ignacio Sarmiento-Barbieri



About

The objective is to map out crime hot spots in different cities across the US. Crime does not spread uniformly accross cities. On the contrary, it tends to cluster in some areas or neighbourhoods and be absent in others. Areas where crime is more concentrated are oftenly referred to as hot spots. There exist multiple ways to try to detect these areas. In this app I identify crime hotspots using a bivariate density estimation strategy. For more on crime hot spots the interested reader is encouraged to visit the National Institute of Justice web site on Hot Spot Policing

The app was builded using the Shiny package available from CRAN. Densities are obtained using the bkde2D function available from the KernSmooth Package. In a nutshell, the function uses a linear binning to obtain counts and uses a Gaussian kernel to obtain the density estimates. Like in any Kernel Density estimation procedure, results (among other factors) depend on the choice of bandwith. I leave the choice to the user, but setting as a default the one that in my opinion produces the best visualization

As more geolocated crime data becomes publicly available I'll be adding them to the App. In the inmeadiate future the cities on deck are:

  • Los Angeles
  • Philadelphiaa
  • St. Louis, Mo

Data Description


Crimes are agregated in three broad categories according to the FBI UCR classification.



Please send comments and/or suggestions to ignaciomsarmiento at gmail.com or vist my website.