之前的帖子应为违反了版规被删了，没看到其他人的回复，所以希望知道答案的同学指点一下

应该是命令格式错误，具体格式见help stepwise。

我查了help stepwise, 没发现格式有问题啊，求详细解答

stepwise属于前缀命令，与其选项pr()、pe()位于均正式命令（如reg）之前，且有冒号分割，具体请认真查看help中的例子（Examples）：
Examples

    Setup
        . sysuse auto
        . generate weight2 = weight^2

    Backward selection
        . stepwise, pr(.2): regress mpg weight weight2 displ gear turn headroom foreign price

    Backward selection; consider engine displacement and gear ratio together
        . stepwise, pr(.2): regress mpg weight weight2 (displ gear) turn headroom foreign price

    Backward selection; force weight to be included in model
        . stepwise, pr(.2) lockterm1: regress mpg weight weight2 displ gear turn headroom foreign price

    Backward selection; force weight and weight2 to be included in model
        . stepwise, pr(.2) lockterm1: regress mpg (weight weight2) displ gear turn headroom foreign price

    Backward hierarchical selection
        . stepwise, pr(.2) hierarchical: regress mpg weight weight2 displ gear turn headroom foreign

    Forward selection
        . stepwise, pe(.2): regress mpg weight weight2 displ gear turn headroom foreign price

    Forward hierarchical selection
        . stepwise, pe(.2) hierarchical: regress mpg weight weight2 displ gear turn headroom foreign price

谢谢啦