Previous versions of this paper were presented at the APSA Annual Meeting in Washington, DC, August 28-31, 2014, at the Carlos III-Juan March Institute of Social Sciences, Madrid, November 28, 2014, and at the European University Institute, Fiesole, January 20, 2016. Any remaining omissions are the sole responsibility of the authors. This research project was supported by Riksbankens Jubileumsfond, Grant M13- 0559:1, PI: Staffan I. Lindberg, V-Dem Institute, University of Gothenburg, Sweden; by Swedish Research Council, Grant C0556201, PI: Staffan I. Lindberg, V-Dem Institute, University of Gothenburg, Sweden and Jan Teorell, Department of Political Science, Lund University, Sweden; and by Knut and Alice Wallenberg Foundation to Wallenberg Academy Fellow Staffan I. Lindberg, Grant 2013.0166, V-Dem Institute, University of Gothenburg, Sweden; as well as by internal grants from the Vice-Chancellor’s office, the Dean of the College of social Sciences, and the Department of Political Science at University of Gothenburg. Jan Teorell also wishes to acknowledge support from the Wenner-Gren Foundation and the Fernand Braudel Senior Fellowship at the European University Institute, Florence, which made it possible for him to work on this paper. We performed simulations and other computational tasks using resources provided by the Notre Dame Center for Research Computing (CRC) through the High Performance Computing section and the Swedish National Infrastructure for Computing (SNIC) at the National Supercomputer Centre in Sweden. We specifically acknowledge the assistance of In-Saeng Suh at CRC and Johan Raber at SNIC in facilitating our use of their respective systems.