Structure, Agency, and Context: The Contributions of Geography to World-Systems Analysis

The interaction of geography and world-systems theory has created two groups of work. The first body of work uses world-systems theory as its theoretical framework with minor levels of critique or change. The second body of work attempts to inform world- systems theory by explicitly including a geographical perspective. Human geographers attracted to world-systems theory provide a perspective that highlights the role of agency in what is widely perceived to be a rigid structuralist approach. Key geographical concepts of region and place are viewed as social constructs created within an overarching context of structural imperatives. By conceptualizing places, states, and the macroregions of core, semiperiphery, and periphery as geographical scales, the role of agency in creating and maintaining the important structures and institutions of the capitalist world-economy, such as hegemony, is illustrated. The geographer's interest in the creation of geographical scales results in analysis of the dynamism of the contemporary world-system.     

Sampling hyperparameters in hierarchical models: Improving on Gibbs for high-dimensional latent fields and large datasets

ABSTRACT

A common Bayesian hierarchical model is where high-dimensional observed data depend on high-dimensional latent variables that, in turn, depend on relatively few hyperparameters. When the full conditional distribution over latent variables has a known form, general MCMC sampling need only be performed on the low-dimensional marginal posterior distribution over hyperparameters. This improves on popular Gibbs sampling that computes over the full space. Sampling the marginal posterior over hyperparameters exhibits good scaling of compute cost with data size, particularly when that distribution depends on a low-dimensional sufficient statistic.     

Temporal blindspots in Occupy Philadelphia

ABSTRACT

This paper analyzes the disjunctive temporalities of Occupy Philadelphia’s political constituencies. Drawing on both an ethnographic participant observation study of the Occupy Philadelphia movement and Philadelphia’s neoanarchist political communities, and on recent social scientific theorization of events, the paper argues that contradictory ideas about temporal timescales, momentum, duration, sequences, and rhythms of tactical and strategic action problematized interaction and coordination among movement participants. These points of coordinative disjuncture can be traced back to differences in participants’ ideas about prefigurative politics and strategic temporalities. Limning the temporal expectations and experiences of social movement participants, this paper contributes to the examination of both linkages and disjunctures between eventful temporalities experienced in moments of protest and in social movements with diverse timescales.