在协方差的时候 用到anova X X X X ,continous(x)  用连续变量，但是说version<11怎么办啊？？？
option continuous(education) not allowed
    Option continuous(education) only allowed under version control with version < 11.  Or, use
    the c. factor variable operator on your continuous variables.
我该怎么写语句啊，