Policy Evaluation Beyond Significance Testing: Evidence from Chicago's ShotSpotter Contract -- by Terence Chau, Philip J. Cook, Javier Lopez, Jens Ludwig, Alejandro Roemer, Adam K. Soliman

This project was supported by Arnold Ventures Grant 24-12760 and University of Chicago Crime Lab general operating funds; the project was reviewed and approved by the University of Chicago’s Institutional Review Board (IRB25-1416). We have no financial or other conflicts of interest to report. Thanks to Aaron Chalfin, David Drukker, John Deke, John MacDonald, Derek Neal, John Pepper, Greg Ridgeway, Evan Rose, Rosanna Smart, Chris Walters and seminar participants at the NBER and the annual American Society of Evidence-Based Policing conference and the LSE / University of Chicago economics of crime conference for helpful comments. Thanks to Natalie Lu for excellent assistance with the data analysis. This work was carried out while Terence Chau was at the University of Chicago Crime Lab, and does not relate to his position at Amazon. Any errors and all opinions are our own. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research.