最小二乘法可以将误差方程转化为有确定解的代数方程组（其方程式数目正好等于未知数的个数），从而可求解出这些未知参数。这个有确定解的代数方程组称为最小二乘法估计的正规方程（或称为法方程）。
正规方程组 Normal equation ; normal equations system ; system of normal equations
正规方程法 normal equation method
正规方程式组 system of normal equations
非正规方程 [数] nonnormal equation
修正的正规方程组 modified system of normal equations
工具变量正规方程 instrumental variable normal equation
正规双曲方程 normal hyperbolic equation
正规化的方程 [数] normalized equation
正规抛物方程 normal parabolic equation
正规双曲型方程组 the normal hyperbolic equations
解线性最小二乘问题时，通常都要解所谓正规方程。
Generally, a linear least squares problem leads to ihc solution of the so called normal equation.
电力系统加权最小二乘准则的状态估计，通常采用正规方程法。
Power system state estimation is usually formulated as a weighted least-squares problem and is solved iteratively by the normal equation method.
讨论了最小二乘多项式拟合中引起正规方程组病态的两个重要原因：节点对原点的偏离程度和节点坐标的数量级。
In this paper two reasons-the deviation of the data from the origin and the size of the data-causing the ill-conditioned normal equations in the least square fitting of a polynomial are discussed.
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