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Re: st: RE: symmetry and homogeneity restrictions


From   Camilla Andersson <camilla.andersson@econ.umu.se>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: symmetry and homogeneity restrictions
Date   Mon, 08 May 2006 21:33:35 +0200

Thank you very much!

Camilla

At 21:31 2006-05-08, you wrote:
Dear Camilla,
Below you will find how you can impose a symmetry and homogeneity
restrictions in the case of a linear version of the AIDS model.
Have a look at the sureg and reg3 help files.
I hope this will help you.
Cheers,
JP



/* Linear Approximate AIDS (LA-AIDS) Model */

/*symmetry restrictions */
constraint define 1 [qBeef]lpp = [qPork]lpb
constraint define 2 [qBeef]lpc = [qChicken]lpb
constraint define 3 [qPork]lpc = [qChicken]lpp

/* homogeneity restrictions*/
constraint define 4 [qBeef]lpb + [qBeef]lpp + [qBeef]lpc + [qBeef]lpt = 0
constraint define 5 [qPork]lpb + [qPork]lpp + [qPork]lpc + [qPork]lpt = 0
constraint define 6 [qChicken]lpb + [qChicken]lpp + [qChicken]lpc +
[qChicken]lpt = 0

global demand1 "(qBeef: w_b lpb lpp lpc lpt lxp co1 si1 t )"
global demand2 "(qPork: w_p lpb lpp lpc lpt lxp co1 si1 t )"
global demand3 "(qChicken: w_c lpb lpp lpc lpt lxp co1 si1 t )"

sureg $demand1 $demand2 $demand3, const(1 2 3 4 5 6) isure




-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Camilla Andersson
Sent: Monday, May 08, 2006 3:31 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: symmetry and homogeneity restrictions

Dear all stata users,

My question is simply: How do I impose symmetry and homogeneity
restrictions in stata?

For example if I want to estimate a regression an impose the parameter
restrictions bnk=bkn

and the sum of all betas is equal to 0?



Kind regards

Camilla

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