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Re: st: Marginal Effects: CLogit


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Marginal Effects: CLogit
Date   Sat, 6 Oct 2012 18:09:38 +0100

The help for -margins- starts off

margins [marginlist] [if] [in] [weight] [, response_options options]

    where marginlist is a list of factor variables or interactions that
    appear in the current estimation results.

That means what it says: so, you are asking something -margins- can't
do it if you offer up continuous variables _as if_ they were factor
variables. That just won't work.

The real questions are thus exactly what you want out of -margins-;
whether that makes sense, and how else to get it, on which others can
advise better than I can.

Nick

On Sat, Oct 6, 2012 at 5:51 PM, Wameq Raza <wameq.r@gmail.com> wrote:

> I was wondering if someone could kindly help me figure out how to get
> the marginal effects of my conditional logit model.
> The syntax I'm using:
>
> clogit hw cost_ time_ wait_,group(id)
> margins cost_ time_ wait_, predict(xb)
>
> These are logged alt specific variables, but the error STATA keeps on
> throwing back at me is:
> "cost_:  factor variables may not contain noninteger values"
>
> However, these are continuous variables and not factor vars. I'm not
> sure how exactly to proceed.
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