软件不能做啊。并不是所有的模型都可以用sw的。
估计还有许多问题没有解决啊


    command defines the estimation command to be executed.  The following Stata commands are supported by stepwise.

        clogit, cloglog, glm, intreg, logistic, logit, nbreg, ologit, oprobit, poisson, probit, qreg, regress,
        scobit, stcox, stcrreg, streg, tobit

stata做不了，可以改用SAS