代码如下：VARIABLE:  MISSING ARE ALL (-99);
  NAMES ARE ID SF1 SF2 SF3 SF4 SF5 SF6 ZZ1 ZZ2 ZZ3 HB1 HB2 HB3 HB4 BR1 BR2 BR3 BR4 BR5 BR6 BR7 BR8 BR9 CM1      CM2 CM3 CM4 CM5;
  usevar ARE SF ZZ HB BR CM;
  within=CM;
  between=BR;
  cluster is ID;
analysis:
  type=twolevel random;
  estimator=ml;
define:
  SF by SF1-SF6;
  ZZ by ZZ1-ZZ3;
  HB by HB1-HB4;
  BR by BR1-BR9;
  CM by CM1-CM5;

output:sampstat;

程序提示：
*** ERROR in DEFINE command
  Error in assignment statement for SF

不知道SF怎么赋值错了