A decision theoretic analysis of the unit root hypothesis using mixtures of elliptical models

Gary Koop and Mark Steel

DES - Working Papers. Statistics and Econometrics. WS from Universidad Carlos III de Madrid. Departamento de Estadística

Abstract: This paper develops a formal decision theoretic approach to testing for a unit root in economic time series. The approach is empirically implemented by specifying a loss function based on predictive variances; models are chosen so as to minimize expected loss. In addition, the paper broadens the class of likelihood functions traditionally considered in the Bayesian unit root literature by: i) Allowing for departures from normality via the specification of a likelihood based on general elliptical densities; ii) allowing for structural breaks to occur; iii) allowing for moving average errors; and iv) using mixtures of various submodels to create a very flexible overall likelihood. Empirical results indicate that, while the posterior probability of trend-stationarity is quite high for most of the series considered, the unit root model is often selected in the decision theoretic analysis.

Keywords: Bayesian; Monte; Carlo; integration; Loss; function; Prediction (search for similar items in EconPapers)
Date: 1993-05
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Related works:
Journal Article: A Decision-Theoretic Analysis of the Unit-Root Hypothesis Using Mixtures of Elliptical Models (1994)
Working Paper: A Decision Theoretic Analysis of the Unit Root Hypothesis Using Mixtures of Elliptical Models (1991)
Working Paper: A decision theoretic analysis of the unit root hypothesis using mixtures of elliptical models (1991)
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Persistent link: https://EconPapers.repec.org/RePEc:cte:wsrepe:3706

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