<>
The -prgen- command holds all other covariates at their mean by default, so
my code has already taken care of your concern. To change the -title-s:
*************
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), /*
*/ xti("Mpg") ytit("Probability")
*************
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Nirina F
Gesendet: Donnerstag, 17. September 2009 17:55
An: [email protected]
Betreff: Re: st: AW: why is this graph all over the place?
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 <[email protected]> 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: [email protected]
> [mailto:[email protected]] Im Auftrag von Nirina F
> Gesendet: Donnerstag, 17. September 2009 13:41
> An: [email protected]
> 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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>
>
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