TY JOUR TI IMPROVED PREDICTING NICKEL PRICE BY AVERAGING RESULTS OF PREDICTED VALUES KW mean relative prediction error KW weighted averaging of designed values KW forecasting KW model operability criteria KW forecast model KW probability to correctly predict the trend of price movement JO Vestnik of Astrakhan State Technical University. Series: Economics AU Paitian, K.. PY 2019 IS 2019 PB Astrakhan State Technical University