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Re: st: re: How to determine the total effect of two opposed effects?


From   Christian Weiß <mail@cweiss.org>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: re: How to determine the total effect of two opposed effects?
Date   Sun, 20 Sep 2009 14:02:48 -0400

Martin and Kit,

thank's alot, work's like charm!
...and finally it pays of that I invested into Stata 11...;)

Chris



On Sun, Sep 20, 2009 at 9:28 AM, Kit Baum <kitbaum@me.com> wrote:
> <>
> Martin helpfully provided
>
> qui reg pr we le c.we#c.le
> margins, dydx(*)
>
> Note that the results of that more concise calculation are exactly in
> agreement with the -lincom- method I posted, with one exception: -margins-
> constructs confidence intervals based on the Normal distribution and
> z-scores, while -lincom- does so with the t distribution (the difference
> that the -small- option invokes on several estimation commands). Naturally
> for a sample of reasonable size this matters not for inference.
>
> You can also do things like
>
> margins, dydx(*) at(weight=4000)
> margins, dydx(*) at(weight=4000 length=200)
>
> to see how these derivatives change over the regressor space.
>
> Kit Baum
> kitbaum@me.com
>
>
>
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