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Re: st: AW: mfx-Elasticity for a dummy variable
From
A Loumiotis <[email protected]>
To
[email protected]
Subject
Re: st: AW: mfx-Elasticity for a dummy variable
Date
Tue, 8 Jun 2010 14:15:22 +0300
The elasticity of y with respect to the dummy variable in the way that
you have defined your regression will be the coefficient of the dummy
variable T divided by the dummy variable itself.
On Tue, Jun 8, 2010 at 2:05 PM, A Loumiotis <[email protected]> wrote:
> Nyasha,
>
> The elasticity of y with respect to the dummy variable in the way that
> you have defined your regression will be the coefficient of the dummy
> variable T times the dummy variable itself. If you calculate it at
> the mean point of T then it will be different from the coefficient of
> the dummy variable. If you calculate it at T=1, it will be the same.
>
> However elasticities with respect to dummy variables have no
> meaningful interpretation because the dummy variable changes in a
> discrete fashion (from 0 to 1).
>
> Antonis Loumiotis
>
> On Mon, Jun 7, 2010 at 6:24 PM, Nyasha Tirivayi <[email protected]> wrote:
>> Dear Martin
>>
>> Thanks for the code. Now the results are different. I was using the
>> wrong code i.e mfx , dyex at(mean) instead of mfx compute,
>> varlist(logweight) dyex at(mean).
>>
>> Regards
>>
>> Nyasha Tirivayi
>> Maastricht University
>>
>>
>>
>> On Mon, Jun 7, 2010 at 9:16 AM, Martin Weiss <[email protected]> wrote:
>>>
>>> <>
>>>
>>> What is the difference of your example to this one - where the marginal
>>> effects do seem to change:
>>>
>>>
>>> *************
>>> sysuse auto, clear
>>> gen logprice=log(price)
>>> gen logweight=log(weight)
>>> reg logprice length logweight foreign
>>> mfx compute, varlist(logweight) dydx at(mean)
>>> mfx compute, varlist(logweight) eyex at(mean)
>>> mfx compute, varlist(logweight) dyex at(mean)
>>> mfx compute, varlist(logweight) eydx at(mean)
>>> *************
>>>
>>>
>>>
>>> HTH
>>> Martin
>>>
>>> -----Ursprüngliche Nachricht-----
>>> Von: [email protected]
>>> [mailto:[email protected]] Im Auftrag von Nyasha Tirivayi
>>> Gesendet: Montag, 7. Juni 2010 02:50
>>> An: [email protected]
>>> Betreff: st: mfx-Elasticity for a dummy variable
>>>
>>> Dear All
>>>
>>> I am trying to estimate elasticity for a dummy explanatory variable in
>>> the following model
>>>
>>> ln(y) = a + b ln(x) + T + D Z
>>>
>>>
>>>
>>> I am interested in calculating the elasticity for T a dummy variable
>>> for a "treatment". What is the formula in stata? Is it mfx,dy/dx or
>>> mfx,dyex?
>>>
>>>
>>>
>>> I have done mfx,dyex and the result still remains the coefficient for
>>> T. Could it be that simple? Or there is another way ?
>>>
>>>
>>>
>>> Kindly advise
>>>
>>>
>>>
>>> Nyasha Tirivayi
>>>
>>> Maastricht University
>>> *
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>>>
>>>
>>> *
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>>>
>>
>> *
>> * For searches and help try:
>> * http://www.stata.com/help.cgi?search
>> * http://www.stata.com/support/statalist/faq
>> * http://www.ats.ucla.edu/stat/stata/
>>
>
*
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