例3.2.1:在例2.1.1的家庭收入-消费支出例中, 1X1 11X X 10 21500 (Xx)= XX X ∑ xX2)(215005365000 1 X H1 XY=/1 Y2_(∑ 15674 X1x….X小) ∑Xx(39468400 可求得 0.7226 0.0003 (XX) 0.00031.35E-07 于是 B=|)(07226 0.0003(15674 103.172 B2 000031.35E-0739648400/(0.7770例3.2.1：在例2.1.1的家庭收入-消费支出例中，         =         =                       =    21500 53650000 10 21500 1 1 1 1 1 1 ( ) 2 2 1 1 2 i i i n n X X n X X X X X X  X    X X '         =         =                        =   39468400 1 1 1 2 15674 1 1 2 i i i n n X Y Y Y Y Y X X  X   X Y 可求得         − − −  = − 0.0003 1.35 07 0.7226 0.0003 ( ) 1 E X X 于是        − =                − − − =         = 0.7770 103.172 39648400 15674 0.0003 1.35 07 0.7226 0.0003 ˆ ˆ ˆ 2 1  E  β