Modelling nonlinearities in commodity prices using smooth transition regression models with exogenous transition variables
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This paper investigates the nonlinearities in commodity prices using smooth transition regression (STR) models. What distinguishes this paper from the majority of the studies in the smooth transition literature is its use of exogenous transition variables, in addition to the standard autoregressive lags of the dependent variable, in modelling the regime switching behavior of commodity prices. Two exogenous transition variables were found successful in capturing the regime switching behavior of commodity prices: inflation rate and oil price. Inflation rate was capable of capturing the early dynamics (between 1900 and 1950) of the commodity index whereas oil price captured the late ones (between 1970 and 2007). This result motivates the use of common exogenous threshold variables in regime switching models in general and, in particular, the use of inflation and oil price in the STR model when applied to an index of commodity prices. The paper also provides further insight on the issue of co-movement of commodity prices by classifying individual commodities into groups according to their border price (an issue that has been ignored in previous studies on commodity prices), and then trying to find the best common transition variable that can explain the dynamic behavior of each group. The results show that, for traded commodities, individual price series recorded on a free on board basis are driven by macroeconomic news in the exporting country. On the other hand, individual price series recorded on a cost and freight basis are driven by oil price and macroeconomic news variables in the importing country.
DescriptionThis is a pre-print of an article published in Statistical Methods & Applications. The final authenticated version is available online at: https://doi.org/10.1007/s10260-014-0275-6.
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