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The forecast of coal sales taking the factors influencing the demand for hard coal into account
In order to prepare a coal company for the development of future events, it is important to predict how can evolve the key environmental factors. This article presents the most important factors influencing the hard coal demand in Poland. They have been used as explanatory variables during the creation of a mathematical model of coal sales. In order to build the coal sales forecast, the authors used the ARMAX model. Its validation was performed based on such accuracy measures as: RMSE, MAPE anddoi:10.24425/gsm.2019.128203 fatcat:fzfnblhvzfczjmbv3uxpamo4ie