Often what you should test is the relative error in terms of ULPs.
通常，就ulp进行测试时考虑的是相对错误。
Estimation of GM (1, 1) model parameter usually adopts the least square criterion, but test of model precision often USES average relative error criterion.
估计GM(1,1)模型中的参数通常采用最小二乘准则，而在模型精度检验时又常采用平均相对误差。
The relative error is only 5% between the forecasting result of Lab model and the result of collapsing test, which also proved that it is a feasible.
实验室模型井架预测结果与试验值相差仅为5％，从而验证这一做法的可行性。
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