Gary Koop (University of Strathclyde, UK and The RImini Centre for Economic Analisys, Italy) Roberto Leon-Gonzalez (National Graduate Institute for Policy Studies, Japan and The RImini Centre for Economic Analisys - Italy) Rodney W. Strachan () (University of Queensland, Australia and The RImini Centre for Economic Analisys - Italy)
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There are both theoretical and empirical reasons for believing that the parameters of macroeconomic models may vary over time. However, work with time-varying parameter models has largely involved Vector autoregressions (VARs), ignoring cointegration. This is despite the fact that cointegration plays an important role in informing macroeconomists on a range of issues. In this paper we develop time varying parameter models which permit cointegration. Time-varying parameter VARs (TVP-VARs) typically use state space representations to model the evolution of parameters. In this paper, we show that it is not sensible to use straightforward extensions of TVP-VARs when allowing for cointegration. Instead we develop a specication which allows for the cointegrating space to evolve over time in a manner comparable to the random walk variation used with TVP-VARs. The properties of our approach are investigated before developing a method of posterior simulation. We use our methods in an empirical investigation involving a permanent/transitory variance decomposition for ination.
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Paper provided by Rimini Centre for Economic Analysis in its series Working Paper Series with number
23-08.
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