你先查查帮助，看看命令是否变化了

或者命令的后面是否缺少选项

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

[此贴子已经被作者于2007-8-19 6:51:48编辑过]

[此贴子已经被作者于2007-8-19 15:51:52编辑过]

有可能是个bug，

不过我很少用菜单，所以不清楚怎么回事