在运行mixlogit choice sde,groud(groud) id(id) rand(sdl)的时候,总是出现r(2000)的错误,也不出结果是什么意思吖?r(2000)里面写的是 Keywords: r(2000) Search: (1) Official help files, FAQs, Examples, SJs, and STBs
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[P] error . . . . . . . . . . . . . . . . . . . . . . . . Return code 2000
no observations;
You have requested some statistical calculation and there are
no observations on which to perform it. Perhaps you specified
if or in and inadvertently filtered all the data.