When the least square criterion is applied to the state estimation of a large scale power system, high order of the equation will make it ill-conditioned.

一个大型电力系统最小二乘方准则的状态估计，由于其阶数很高而出现病态倾向。

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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。

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Aiming at those problems, a time calibration algorithm based on Least-Square Criterion is presented.

针对上述问题，提出了一种基于最小二乘准则的时间校准算法。

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"Some 45, 000 square kilometers in Western Europe have measurable levels of radioactivity in the soil from Chernobyl above the criterion applied in the former Soviet Union to designate 'contaminated' areas, " said UNSCEAR Secretary Malcolm Crick.

CNN: 26 years on: helping Chernobyl's children