2 Essay 83.1 Big Data and Bad Data: On the Sensitivity of Security Policy to Imperfect Information James T. Graves PhD Candidate (Engineering and Public Policy) 2016, Carnegie Mellon University Alessandro Acquisti Professor of Information Technology and Public Policy, Carnegie Mellon University Nicolas Christin Assistant Research Professor of Electrical and Computer Engineering, Carnegie Mellon University Cybersecurity Institutional Design Law and Economics Law Enforcement/Policing National Security