对未知参数估计值的方差、解释变量的误删（误加）、多重共线性等问题进行了研究，给出两个重要的结论且进行了严格的理论证明.%The variance of the estimated values of unknowm parameters, underspecification of a regression equation, overspecification of a regression equ ation, mutuality of linearity are discussed. Two important conclusions were proved.
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