∑ (8-6) 回归方程组系数由下列正规方程组决定: Ln1b1+…+L1nbhm= Lz1b1+…+L2nbn=L2y (8-7) Lnb1+…+ L b=L b=y-∑b_ 1 11 1 1 1 21 1 2 2 1 1 _ _ 0 1 1 (8 6) 8 7 N k i M m y m m y m mm m my N i i i y y N L b L b L L b L b L L b L b L b y b y = = = − + + = + + = + + = = − 回归方程组系数由下列正规方程组决定: ( - )