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Re: st: margins / over / dydx


From   Jeffrey Pitblado <jpitblado@stata.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: margins / over / dydx
Date   Wed, 04 Jan 2012 13:39:32 -0600

Richard Williams <richardwilliams.ndu@gmail.com> had a follow-up question
regarding the new contrast features in -margins-:

Robert Duval <rduval@gmail.com> wants to compute a comparison of the results
from -margins- with the -over()- option:

...
In Stata 12, -margins- has new options for computing contrasts of margins.
These new features are documented in -[R] margins, contrast-.

For Robert's example above, simply add a contrast operator in the -over()-
option:

. margins , over(r.sex) contrast

Very good. But the contrast option doesn't seem to add anything in this case, i.e

margins , over(r.sex)

seems to produce the exact same output as your command. Or am I missing something?

The -contrast- option could be left off, it adds nothing.  It was a left-over
from the first draft of my response.

--

--Jeff Pitblado
  jpitblado@stata.com
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