41,249 research outputs found
A Framework for Spatio-Temporal Data Analysis and Hypothesis Exploration
We present a general framework for pattern discovery and hypothesis exploration in spatio-temporal data sets that is based on delay-embedding. This is a remarkable method of nonlinear time-series analysis that allows the full phase-space behaviour of a system to be reconstructed from only a single observable (accessible variable). Recent extensions to the theory that focus on a probabilistic interpretation extend its scope and allow practical application to noisy, uncertain and high-dimensional systems. The framework uses these extensions to aid alignment of spatio-temporal sub-models (hypotheses) to empirical data - for example satellite images plus remote-sensing - and to explore modifications consistent with this alignment. The novel aspect of the work is a mechanism for linking global and local dynamics using a holistic spatio-temporal feedback loop. An example framework is devised for an urban based application, transit centric developments, and its utility is demonstrated with real data
Trade Coefficients and the Role of Elasticity in a Spatial CGE Model Based on the Armington Assumption
The Armington Assumption in the context of multi-regional CGE models is commonly
interpreted as follows: Same commodities with different origins are imperfect substitutes for each
other. In this paper, a static spatial CGE model that is compatible with this assumption and
explicitly considers the transport sector and regional price differentials is formulated. Trade
coefficients, which are derived endogenously from the optimization behaviors of firms and
households, are shown to take the form of a potential function. To investigate how the elasticity
of substitutions affects equilibrium solutions, a simpler version of the model that incorporates
three regions and two sectors (besides the transport sector) is introduced. Results indicate: (1) if
commodities produced in different regions are perfect substitutes, regional economies will be
either autarkic or completely symmetric and (2) if they are imperfect substitutes, the impact of
elasticity on the price equilibrium system as well as trade coefficients will be nonlinear and
sometimes very sensitive.Armington Assumption, Spatial CGE, Elasticity of substitution, Trade coefficient, Econometric model
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