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Re: st: AW: why is this graph all over the place?


From   Nirina F <fstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: AW: why is this graph all over the place?
Date   Thu, 17 Sep 2009 11:54:43 -0400

Thank you very much Martin for  your help. It worked so well.

I have a few questions:

is it possible also to graph the marginal effects of just the mpg at
each value of mpg. I know if you calculate
. mfx
after
. prob for price mpg rep78 headroom trunk weight

then you get the marg. effects at the mean value but I would like the
marginal effects at each value of mpg but keeping the other variables
at their mean. I am aware of the -at- option but it's just difficult
to graph it.

Also, How would I change the name of the xaxis and yaxis of the previous graph?

Thank you very much,

Nrina


On Thu, Sep 17, 2009 at 8:00 AM, Martin Weiss <martin.weiss1@gmx.de> wrote:
>
> <>
>
> For these purposes, Scott Long`s -findit spost- comes in handy. Of course,
> Long and Freese (2006), http://www.stata-press.com/books/regmodcdvs.html, is
> the canonical reference for what you are trying to achieve. Try this:
>
>
> *************
> sysuse auto, clear
> prob for price mpg rep78 /*
> */  headroom trunk weight
>
> ins mpg
> loc uniq= r(N_unique)
>
> su mpg, mean
> prgen mpg, from(`r(min)')  /*
> */ to(`r(max)') /*
> */ gen(prob) n(`uniq')
>
> tw (connected probp1 probx)
> *************
>
>
>
> HTH
> Martin
>
>
> -----Ursprüngliche Nachricht-----
> Von: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Nirina F
> Gesendet: Donnerstag, 17. September 2009 13:41
> An: statalist@hsphsun2.harvard.edu
> Betreff: st: why is this graph all over the place?
>
> Dear all,
>
> I would like to graph the predicted probabilities of  having foreign
> against mpg in order to highlight the slope(basically the marginal
> effects) at each value of mpg.
> I run the following but it is all over the place because I think it is
> giving me the predicted probabilities from different variables.
> Could you help me in this please. also if you could help me graph the
> marginal effects of mpg from this probit equation against each value
> of mpg.
>
> probit  foreign price mpg rep78 headroom trunk weight
> predict pmpg, p
> sort mpg
> twoway line  pmpg mpg
>
> Thank you veyr much,
> N
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