SPID: A New Database for Inferring Public Policy Innovativeness and Diffusion Networks

Despite its rich tradition, there are key limitations to researchers' ability to make generalizable inferences about state policy innovation and diffusion. This paper introduces new data and methods to move from empirical analyses of single policies to the analysis of comprehensive populations of policies and rigorously inferred diffusion networks. We have gathered policy adoption data appropriate for estimating policy innovativeness and tracing diffusion ties in a targeted manner (e.g., by policy domain, time period, or policy type) and extended the development of methods necessary to accurately and efficiently infer those ties. Our state policy innovation and diffusion (SPID) database includes 728 different policies coded by topic area. We provide an overview of this new dataset and illustrate two key uses: (i) static and dynamic innovativeness measures and (ii) latent diffusion networks that capture common pathways of diffusion between states across policies. The scope of the data allows us to compare patterns in both across policy topic areas. We conclude that these new resources will enable researchers to empirically investigate classes of questions that were difficult or impossible to study previously, but whose roots go back to the origins of the political science policy innovation and diffusion literature.     

Muslims in Melanesia: putting security issues in perspective

The hype about the potential for terrorism in Melanesia due to the region's weak and failing states has obscured some of the less newsworthy but equally important developments. One of these is the slow but steady growth in the popularity of Islam in Melanesia. This article reviews the limited literature on terrorism in the Pacific. It provides a brief historical overview of the growth of Islam in Melanesia on a country-by-country basis, and draws on a comparative case study and theories of culture and public goods to explore possible reasons for Islam's appeal. It argues that although Islam is likely to continue to grow, its growth is neither a necessary or sufficient basis for declaring terrorist threats to exist. The article emphasises the need to analyse the broader social factors behind Islam's growth as a basis for understanding the conditions through which potential threats to regional security might develop.