A,B两种药，各三个水平，交互作用有统计学意义，于是用LMATRIX语句分析两因素各个水平组合的交互作用，语句如下
DATASET ACTIVATE 数据集1.
UNIANOVA y BY druga drugb
  /METHOD=SSTYPE(3)
  /INTERCEPT=INCLUDE
  /CRITERIA=ALPHA(0.05)
  /DESIGN=druga drugb druga*drugb.
  /LMATRIX = 'B1~B3 at A1'
   drugb 1 -1 0 druga*drugb 1 -1 0 0 0 0 0 0 0
   drugb 1 0 -1 druga*drugb 1 0 -1 0 0 0 0 0 0
   drugb 0 1 -1 druga*drugb 0 1 -1 0 0 0 0 0 0

无论第8句有无“=”号，无论单引号还是双引号，都会出现
“/LMATRIX  'B1~B3 at A1'

>Error # 1.  Command name: /LMATRIX
>The first word in the line is not recognized as an SPSS Statistics command.
>Execution of this command stops.”
的错误，求助啊！！！