Adoption of policy innovations

The study of the spread of policy innovations across political units has deep roots within political science. With the introduction of event history analysis, Berry & Berry (1990) fostered a large body of work within the United States and abroad that examines the internal and external determinants of policy innovation adoption. Throughout much of the history of this research, geographic patterns of adoption were the primary mechanism through which diffusion was expected to occur. Lawrence J. Grossback, Sean Nicholson-Crotty, and David A. M. Peterson (2004) offered their own innovation within the research program, which enhanced attention to the ideological pathways through which some policies spread. Jointly with Daniel Mallinson (Penn State), Victor Cruz seeks to provide clarification for an important aspect of their measure of relative ideology that has been inconsistently applied in subsequent studies: tied adoptions. As the study of ideological patterns of diffusion progresses, it is important to ensure our measure of this key concept is reliable and consistent across studies. Otherwise, it will be difficult to gather summative evidence of its generalizability across policies and time. For further information contact Victor Cruz.