But the complexity of the problem, the indefinite of the factors and especially the limits of the predicting method made large error between the prediction value and the reality.
但由于问题本身的复杂性、影响因素的不确切性、特别是预测方法的局限性，使得目前需水预测误差较大。
The prediction value tallied with the actual drilling result, and the average error was 11%.
预测与实钻结果吻合较好，实钻误差平均为11%。
The experimental results show that the absolute value of mean error of such prediction and control precision is within 5% , which gets good effect on sheet shape control. The BP network m…
仿真与实验结果表明：该模型预测和控制板形精度的平均误差绝对值均在5％之内，具有较好的效果，可应用于板形在线预测与控制。
As the name suggests, the mean absolute error is an average of the absolute errors, where is the prediction and the true value.
顾名思义，平均绝对误差是绝对误差的平均值，其中fi是预测值而yi是实际值。
Slope system is a sort of typical complex gray system, applying classical gray prediction model will engender large error in predicted value due to the high discrete degree of monitored displacement.
边坡系统是一类典型的复杂灰色系统，由于其位移监测数据离散程度较高，因此应用经典灰色预测模型往往会出现预测值偏差较大的情况。
The results indicate:(1)the mean absolute value of relative error of the prediction results of this model has been reduced at 0.13% (the original is 3.92% in the PLS model);
研究结果：（1）此模型预测结果的相对误差绝对值均值从PLS模型的3.92%，降低到了0.13%；
The results indicate:(1)the mean absolute value of relative error of the prediction results of this model has been reduced at 0.13% (the original is 3.92% in the PLS model);
研究结果：（1）此模型预测结果的相对误差绝对值均值从PLS模型的3.92%，降低到了0.13%；
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