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Re: st: margeff/margins discrepancy
From
"Joao Ricardo F. Lima" <[email protected]>
To
[email protected]
Subject
Re: st: margeff/margins discrepancy
Date
Mon, 26 Apr 2010 20:27:25 -0300
Dear Richard and Statalister,
use -margeff, at(mean) replace-
************begin example***********
sysuse nlsw88.dta, clear
probit married wage if age==45
margeff, at(mean) replace
margins, dydx(wage)
*************end example**********
. margeff, at(mean) replace
Partial effects at fixed values after margeff
y = Pr(married)
------------------------------------------------------------------------------
variable | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
wage | -.0071581 .0151697 -0.47 0.637 -.0368903 .022574
------------------------------------------------------------------------------
. margins, dydx(wage)
Warning: cannot perform check for estimable functions.
Average marginal effects Number of obs = 78
Expression : Linear prediction, predict()
dy/dx w.r.t. : wage
------------------------------------------------------------------------------
| Delta-method
| dy/dx Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
wage | -.0071581 .0151697 -0.47 0.637 -.0368903 .022574
------------------------------------------------------------------------------
. which margeff
c:\ado\plus\m\margeff.ado
*! Obtain partial effects after estimation
*! Version 2.2.0 (20 August 2009) (Revision of Stata Journal submission)
*! Author: Tamas Bartus (Corvinus University, Budapest)
.
. update query
(contacting http://www.stata.com)
Stata executable
folder: C:\Arquivos de programas\Stata11\
name of file: StataSE.exe
currently installed: 20 Apr 2010
latest available: 20 Apr 2010
Ado-file updates
folder: C:\Arquivos de programas\Stata11\ado\updates\
names of files: (various)
currently installed: 20 Apr 2010
latest available: 20 Apr 2010
Utilities updates
folder: C:\Arquivos de programas\Stata11\utilities
names of files: (various)
currently installed: 11 Feb 2010
latest available: 11 Feb 2010
Recommendation
Do nothing; all files up to date.
HTH,
Joao Lima
2010/4/26 Michael Norman Mitchell <[email protected]>:
> Dear Richard
>
> Indeed, I am using a different version of -margeff- than you are. I am
> using this version from
>
> http://www.stata-journal.com/software/sj5-3/
> Stata Journal volume 5, issue 3
>
> and here is the -which- information
>
> . which margeff
> c:\ado\plus\m\margeff.ado
> *! Marginal effects for categorical dependent variable models
> *! This version: 22 April 2005 (Stata Journal submission)
> *! Author: Tamas Bartus (Corvinus University Budapest)
>
> I don't know if that helps to solve this, but there it is :)
>
> Best regards,
>
> Michael N. Mitchell
> See the Stata tidbit of the week at...
> http://www.MichaelNormanMitchell.com
>
> On 2010-04-25 8.47 PM, Richard Williams wrote:
>>
>> At 09:14 PM 4/25/2010, Michael Mitchell wrote:
>>>
>>> Greetings
>>>
>>> Hmmm... ran your code and I get the same coefficient and se from
>>> -margeff- and -margins- using Stata 11, see below
>>
>> ...
>>
>>> Did I do something wrong not to get different results?
>>
>> It is not often that we get questions like this -- "Did I do something
>> wrong that caused me to get the correct results?" :)
>>
>> Personally, I get different results from the two programs, margeff and
>> margins. Why you get it right, I don't know. Are you using the same
>> versions of Stata and margeff as everyone else? If so, is there any chance
>> that at some point you patched your margeff and have since forgotten about
>> it? Here is what I get.
>>
>> . which margeff
>> c:\ado\plus\m\margeff.ado
>> *! Obtain partial effects after estimation
>> *! Version 2.2.0 (20 August 2009) (Revision of Stata Journal
>> submission)
>> *! Author: Tamas Bartus (Corvinus University, Budapest)
>>
>> . update query
>> (contacting http://www.stata.com)
>>
>> Stata executable
>> folder: C:\Program Files\Stata11\
>> name of file: StataSE.exe
>> currently installed: 20 Apr 2010
>> latest available: 20 Apr 2010
>>
>> Ado-file updates
>> folder: C:\Program Files\Stata11\ado\updates\
>> names of files: (various)
>> currently installed: 20 Apr 2010
>> latest available: 20 Apr 2010
>>
>> Utilities updates
>> folder: C:\Program Files\Stata11\utilities
>> names of files: (various)
>> currently installed: 11 Feb 2010
>> latest available: 11 Feb 2010
>>
>> Recommendation
>> Do nothing; all files up to date.
>>
>>
>>
>> -------------------------------------------
>> Richard Williams, Notre Dame Dept of Sociology
>> OFFICE: (574)631-6668, (574)631-6463
>> HOME: (574)289-5227
>> EMAIL: [email protected]
>> WWW: http://www.nd.edu/~rwilliam
>>
>> *
>> * 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/
>
> *
> * 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/
>
--
----------------------------------------
Joao Ricardo Lima, D.Sc.
Professor
UFPB-CCA-DCFS
Fone: +5538387264913
Skype: joao_ricardo_lima
----------------------------------------
*
* 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/