Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: modeling constraint question


From   "William P. Kittredge" <kittredgewp@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: modeling constraint question
Date   Tue, 26 Apr 2005 15:02:35 -0700 (PDT)

Does anyone know a way to constrain the predict
function?  I'm working with a simple funding model
that the organization is comfortable with:

funding06 = bx1 + bx2+ bx3+e
predict funding07

I'd like to constrain the funding07 values for each
grantee so that they are +/- a given percent (e.g. if
the budget goes down 10% each grantee gets 10% less.

The reason for doing it this way, I'm told, is that
the variables (e.g. x1) change differently from year
to year for each grantee and that the 'need' they
represent is also supposed to alter their funding
(need based) all else equal.

I'm pretty new to this, so club me gently if this
makes no sense.

Bill Kittredge
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index