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st: Problem with synth for Stata


From   "[ISO-8859-1] Andrs Castaeda" <r.andres.castaneda@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Problem with synth for Stata
Date   Wed, 18 Nov 2009 10:58:48 -0500

HI.
I have just downloaded the program Synth for STATA and I got some
problems with it. I am trying to see if the war of Colombia has any
effect on the foreign risk and investment perception using political
events about conflict. I have a time series daily data base and when I
try to use the ?synth? command I got the following error: ?expression
too long? r(130), despite the treatment periods that I use. The error
message says something like this: ?In the first case, you specified an
expression that is too long for Stata to process -- the expression
contains more than 255 pairs of nested parentheses or more than 500
dyadic operators.  Break the expression into smaller parts.  In the
second case, the expression contains more than five sum() functions.
This expression, too, will have to be broken into smaller parts.? But
I don?t know what the message means with ?the expression has to be
broken into smaller parts?. What can I do????
I tried the following and I got the same error in all the cases:
·        synth car meanabn(570(1)580), trunit(4) trperiod(583) nested
·        synth abn meanabn(570(1)580), trunit(4) trperiod(583) nested
·        synth abn meanabn(570(1)580), trunit(4) trperiod(583) nested allopt
·        synth abn car, trunit(4) trperiod(583) nested

Thank you so much for your help.
best
--
greetings


Andrés Castañeda
Facultad de Economía
Universidad del Rosario.
(571) 2970200 Ext: 625
Casa Pedro Fermín Calle 14 N° 4-69



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