Scandinavian Working Papers in Economics

Working Papers,
National Institute of Economic Research

No 59: A Hidden Markov Model as a Dynamic Bayesian Classifier, With an Application to Forecasting Business-Cycle Turning Points

Lasse Koskinen and Lars-Erik Öller ()
Additional contact information
Lasse Koskinen: National Institute of Economic Research, Postal: National Institute of Economic Research, P.O. Box 3116, SE-103 62 Stockholm, Sweden
Lars-Erik Öller: National Institute of Economic Research, Postal: National Institute of Economic Research, P.O. Box 3116, SE-103 62 Stockholm, Sweden

Abstract: We introduce a method for dynamic classification of vector time series data into different regimes. A hidden Markov regime-switching model is used in classification. Past regimes are determined in advance and characterized by first and second moments of the observation vector. In estimation and model selection, instead of the maximum likelihood principle, we use Brier´s probability score making it possible to perform feature extraction, eg. noise-removing filtering. When calibrated to the forecast horizon, the method provides a simple and computationally efficient way to utilize leading information in forecasting regimes in time series. The method is applied on forecasting turning points of Sweden`s industrial production, where the Stock Market Index and a Business Tendency Survey series together express expectations, providing leading information. The method is also tested on forecasting the business cycle of the US, using GDP and the Department of Commerce Composite Index of Leading Indicators.

Keywords: Empirical Bayesian; Expectation; Leading Indicator; Pattern Recognition; Probability Forecast; Regime-Switching Model

23 pages, April 1, 1998

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