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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 12:46:26 -0400

Dear Martin,

Thank you very much for the clarification.
How about graphing the marginal effects next to that graph?
nrina

On Thu, Sep 17, 2009 at 12:04 PM, Martin Weiss <martin.weiss1@gmx.de> wrote:
>
> <>
>
> 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: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Nirina F
> Gesendet: Donnerstag, 17. September 2009 17:55
> An: statalist@hsphsun2.harvard.edu
> 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 <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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>
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