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Re: st: passing an equation list?


From   Maarten Buis <maartenlbuis@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: passing an equation list?
Date   Sat, 13 Oct 2012 22:19:44 +0200

On Sat, Oct 13, 2012 at 9:31 PM, Sun Yutao
<yutao.sun.statalist@outlook.com> wrote:
> Does anyone know how to pass an equation list : (fist: y=x) (second: x=z) .... into a stata "program"?

That depends on the program, the exact form of the functions, how
general you want it to be, etc. etc. One possibility is to have it all
in one string and start parsing on the brackets, you would need a way
of distinguishing between brackets that are part of the equation and
brackets that are deliminating different equations, but with some
careful thought that can be done. Alternatively you can let each
equation be an option. This can be especially attractive if there is a
known (maximum) number of equations.

You can always take a look inside other programs that allow multiple
equations, and see how they handle those: e.g. -heckman- could be an
example where the different equations are handled through an option
and a regular varlist or -sureg- is an example where the equations are
deliminated with brackets. To look inside programs you can use
-viewsource-.

Hope this helps,
Maarten

---------------------------------
Maarten L. Buis
WZB
Reichpietschufer 50
10785 Berlin
Germany

http://www.maartenbuis.nl
---------------------------------
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