The results show that the average absolute value of relative errors between predictive and measured values of hardness is 5.90%, the prediction accuracies of adhesion and impact resistance are 100%.

结果表明：硬度预测值与实验值相对误差的绝对值的平均值为5.90%，附着力预测准确率为100%，耐冲击性预测准确率为100%。

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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。

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