Re: [Gretl-users] R: R: R: Restriction on model coefficients
On Tue, 9 Feb 2016, Carlo Maria Petrangelo wrote:
In which sense a working example?
For now I apply your suggested modifications, thank you!
However, if I put "b4-b2=[0,0408413/(1-4,17913)](1-b3)" instead of "
b4=[0,0408413/(1-4,17913)](1-b3)-b2" it seems better, because it puts
"b4+b2=0" (obviously), and estimate the coefficients without a predetermined
zero value in b4 as it did before.
Please read the documentation for the "restrict" command. When using
the simplest method (which you are attempting) the restriction must
take the form of a linear combination of parameters on the left and a
scalar value on the right.
Putting your restriction into something resembling this form we get
(b4-b2)/(1-b3) = -0.012846691
but since this is nonlinear you actually have to use the "rfunc" form
of the command, as in
function matrix my_restrict (const matrix b)
matrix v = (b[4]-b[2])/(1-b[3]) + 0.012846691
return v
end function
restrict wage
rfunc = my_restrict
end restrict
gretl will then use the delta method to evaluate the test.
Allin Cottrell