A=-月x ∑(x-x)y1-y 解得A xy-xy或B1=21 X-x ∑(x-x) 其中x=1x,1=1,x=12x,x=1x (经验)回归方程为:=B+Bx=y+B1(x-x) −− == −2 2 10 1 ˆˆ ˆ x x xy x y y x    解得 （经验）回归方程为: ( ) ˆ ˆ ˆ ˆ 0 1 1 y =  +  x = y +  x − x 或 ( )( ) ( )  = = − − − = ni i ni i i x x x x y y 1 2 1 1 ˆ 其中   = = = = n i i n i i y n x y n x 1 1 1 , 1 ，   = = = = n i i i n i i x y n x xy n x 1 1 2 2 1 , 1