Adjusted ARIMA model δ.

δ The parameters correspond to the observed effects for a differentiated series, i.e., a series where the trend and seasonal deterministic patterns were removed first, in order to improve the stochastic estimation in the stochastic model.* Non-significant at a level of 0.05€ Previous months identified as important for predicting the variation of the current month¥ Disturbances occurred during a previous month, which affect the current realization of the phenomenonβ Seasonal effect (past year value) that affects the current value of the time seriesAdjusted ARIMA model δ.