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Goodness-of-fit testing for the marginal distribution of regime-switching models with an application to electricity spot prices

Joanna Janczura and Rafał Weron ()

AStA Advances in Statistical Analysis, 2013, vol. 97, issue 3, 239-270

Abstract: This paper complements a recently published study (Janczura and Weron in AStA-Adv Stat Anal 96(3):385–407, 2012 ) on efficient estimation of Markov regime-switching models. Here, we propose a new goodness-of-fit testing scheme for the marginal distribution of such models. We consider models with an observable (like threshold autoregressions) as well as a latent state process (like Markov regime-switching). The test is based on the Kolmogorov–Smirnov supremum-distance statistic and the concept of the weighted empirical distribution function. The motivation for this research comes from a recent stream of literature in energy economics concerning electricity spot price models. While the existence of distinct regimes in such data is generally unquestionable (due to the supply stack structure), the actual goodness-of-fit of the models requires statistical validation. We illustrate the proposed scheme by testing whether commonly used Markov regime-switching models fit deseasonalized electricity prices from the NEPOOL (US) day-ahead market. Copyright The Author(s) 2013

Keywords: Regime-switching; Energy economics; Goodness-of-fit; Weighted empirical distribution function; Kolmogorov–Smirnov test (search for similar items in EconPapers)
Date: 2013
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