Mathematics – Statistics Theory
Scientific paper
2006-10-22
Mathematics
Statistics Theory
33 pages, 7 figures, to appear in Probability Theory and Related Fields
Scientific paper
10.1007/s00440-011-0345-8
We introduce graphical time series models for the analysis of dynamic relationships among variables in multivariate time series. The modelling approach is based on the notion of strong Granger causality and can be applied to time series with non-linear dependencies. The models are derived from ordinary time series models by imposing constraints that are encoded by mixed graphs. In these graphs each component series is represented by a single vertex and directed edges indicate possible Granger-causal relationships between variables while undirected edges are used to map the contemporaneous dependence structure. We introduce various notions of Granger-causal Markov properties and discuss the relationships among them and to other Markov properties that can be applied in this context.
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