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re: st: Simulating time series with if else condition


From   Christopher Baum <kit.baum@bc.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   re: st: Simulating time series with if else condition
Date   Tue, 21 Feb 2012 18:09:07 -0500

<>
Untested, but I think you can replace


if fyear==1971{
     by id: replace debtlevel_sim=actual_debtlevel                 
/*start with actual debt-level in 1971*/
     }
else if fyear>1971 & (L.debtlevel_sim+debtissue_sim)<=0 {        /*in  
years following 1971: no negative debt-level*/
     by id: replace debtlevel_sim=0
     }
else {
     by id: replace debtlevel_sim=L.debtlevel_sim+debtissue_sim 


with one line:


by id: replace debtlevel_sim = cond( fyear==1971, actual_debtlevel, max(0, L.debtlevel_sim+debtissue_sim ))


Kit Baum   |   Boston College Economics and 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


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