(B)n=(41-1)-(41-1)-(1-) 11=11.=+ 出,出/分别为A、B、AB观测值 总体平均数;且 ∑a=0∑B1=0∑(aB)1=∑(aB1=2∑(aB)n=0分别为Ai、Bj、Ai Bj观测值 总体平均数；且 0, 0, ( ) ( ) ( ) 0, 1 1 1 1 1 1      = = = = = = = = = = = n i b j a i b j i j i j i j a i b j i  j                   = − − + = − −  − −  − i j i j i j i j i j . . ( ) ( ) ( ) ( ) i  j ij ,