求翻译：最优加权法组合预测的误差评价指标值比各单项预测方法都要小，说明最优加权法组合预测能有效降低预测误差。是什么意思？

A combination of the optimal weighting method prediction error evaluation value is smaller than each individual prediction methods, the combination of the optimal weighting method to predict the forecast error can be reduced effectively.

Optimal weighting method combination forecast error evaluation of the value of the indicators than the individual forecasts are smaller, the optimal weighting method can be effective in reducing forecast combination forecast errors.

The most superior method of weighting combination forecast error appraises the target value all to have to be smaller than various single items forecast method, showed the most superior method of weighting combination forecast can reduce the forecast error effectively.

Error evaluation of optimal weighted combination method predicting index has a smaller value than the individual prediction method, description method of optimal weighted combination forecasting can effectively reduce forecast error.

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