I think I have identified the problem. Unlike the older version of
-margeff- (4/22/2005), -margeff8- (2/10/2006), and -mfx-, the newer
version of -margeff- (4/20/2008, v. 2.1.8) appears to require that
brackets be placed inside the parentheses when using the "at()"
option. The following two lines of code appear to work and yield
identical results:
. margeff compute, at([], x3=20 )
. margeff compute, at([mean], x3=20 )
The inclusion of the comma after the brackets has no bearing on the
command's functioning.
--
Jim
On Thu, Jul 9, 2009 at 11:32 AM, Kit Baum<[email protected]> wrote:
> <>
>
> logit foreign price trunk mpg weight
> margeff compute, at(mean mpg=20 trunk=10)
> works fine. Admittedly the help file suggests you can omit the word
> 'mean', but as that is the stated default, it doesn't hurt to use it.
>
> which margeff
>
> *! Obtain partial effects after estimation
> *! Version 2.1.8 (20 April 2008) (Revision of Stata Journal
> submission)
> *! Author: Tamas Bartus (Corvinus University, Budapest)
>
>
> Kit Baum | Boston College Economics & DIW Berlin | http://ideas.repec.org/e/pba1.html
> An Introduction to Stata Programming
> | http://www.stata-press.com/books/isp.html
> An Introduction to Modern Econometrics Using Stata | http://www.stata-press.com/books/imeus.html
>
>
>
>
> *
> * 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/
>
--
James W. Shaw, Ph.D., Pharm.D., M.P.H.
Assistant Professor
Department of Pharmacy Administration
College of Pharmacy
University of Illinois at Chicago
833 South Wood Street, M/C 871, Room 252
Chicago, IL 60612
Tel.: 312-355-5666
Fax: 312-996-0868
Mobile Tel.: 215-852-3045
*
* 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/
