Abstract
The analysis of structural-change models is nowadays a popular subject of research both in econometric and statistical literature. The most challenging task is to identify multiple breaks occurring at unknown dates. In case of multiple shifts in mean Cappelli and Reale (Provasi, C. (eds.) S.Co. 2005: Modelli Complessi e Metodi Computazionali Intensivi per la Stima e la Previsione, pp. 479–484. Cleup, Padova, 2005) have proposed a method called ART that employs regression trees to estimate the number and location of breaks. In this paper we focus on regime changes due to breaks in the coefficients of a parametric model and we propose an extension of ART that addresses this topic in the general framework of the linear model with multiple structural changes. The proposed approach considers in the tree growing phase the residuals of parametric models fitted to contiguous subseries obtained by splitting the original series whereas tree pruning together with model selection criteria provides the number of breaks. We present simulation results well as two empirical applications pertaining to the behavior of the proposed approach.
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Note that estimation methods such as FM-OLS that allow for nonstationarity have not been considered due to the short sample size in the two sub-regimes.
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Paper partially supported by MIUR grant (code 2008WKHJPK-PRIN2008-PUC number E61J10000020001)
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Cappelli, C., Iorio, F.D. (2013). Theoretical Regression Trees: A Tool for Multiple Structural-Change Models Analysis. In: Grigoletto, M., Lisi, F., Petrone, S. (eds) Complex Models and Computational Methods in Statistics. Contributions to Statistics. Springer, Milano. https://doi.org/10.1007/978-88-470-2871-5_6
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