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Imposing coefficient restriction on SUR model

Posted: Tue Apr 14, 2020 10:39 am
by londonphd
Hi,
I have the following three equation to be estimtaed via SUR.

Code: Select all

y1=c(1)+c(2)*x1 y2=c(3)-c(4)*x21+c(5)*x22 y3=c(6)+c(7)*x31+c(8)*x32
I've estimated the system using SUR method, and now I want to impose restrictions on the coefficeints as follows:

Code: Select all

c(5)=c(8) c(4)=c(7)=-c(5)/(1-c(1))
How do I pass these restrictions on to the SUR model?
Can anyone please help?

Re: Imposing coefficient restriction on SUR model

Posted: Tue Apr 14, 2020 11:52 am
by startz
Hi,
I have the following three equation to be estimtaed via SUR.

Code: Select all

y1=c(1)+c(2)*x1 y2=c(3)-c(4)*x21+c(5)*x22 y3=c(6)+c(7)*x31+c(8)*x32
I've estimated the system using SUR method, and now I want to impose restrictions on the coefficeints as follows:

Code: Select all

c(5)=c(8) c(4)=c(7)=-c(5)/(1-c(1))
How do I pass these restrictions on to the SUR model?
Can anyone please help?

Code: Select all

y1=c(1)+c(2)*x1 y2=c(3)-(-c(8)/(1-c(1)))*x21+c(8)*x22 y3=c(6)+(-c(8)/(1-c(1)))*x31+c(8)*x32

Re: Imposing coefficient restriction on SUR model

Posted: Wed Apr 15, 2020 4:14 am
by londonphd
Great, thanks.