Estimation of GM (1, 1) model parameter usually adopts the leastsquare 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。
2
On the data including the discrete points, leastsquareestimation can not control the strong error affecting the regression curve.
在含有离群值的情况下，分析了最小二乘估计不能克服粗大误差对回归曲线的影响。
3
Act as routine dispose signal estimation route to, recursion leastsquare method possess in a position to at approximate time bring relative comparison small error.