jinyuguo 发表于 2014-4-23 09:44 
趋势平稳序列的回归,有两种方法:一是除去趋势(差分也行);二是在方程中加入时间变量(t)。否则犯遗漏变 ...
你好,感谢你的回答。对于漂移平稳,我指的是在检验平稳的过程中添加drift的选项。除此之外还有noconstant的选项,他们的说明如下。不只如果直接检验是不平稳的而用了这样的选项之后才会平稳的序列,能否直接用于回归。
    noconstant :suppresses the constant term (intercept) in the model and indicates that the process under the
        null hypothesis is a random walk without drift.  noconstant cannot be used with the trend or drift
        option.
    trend: specifies that a trend term be included in the associated regression and that the process under the
        null hypothesis is a random walk, perhaps with drift.  This option may not be used with the noconstant
        or drift option.
    drift: indicates that the process under the null hypothesis is a random walk with nonzero drift.  This
        option may not be used with the noconstant or trend option.