Non linear regression help

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spssaltijdlastig
Posts: 4
Joined: Fri Nov 02, 2012 4:18 pm

Non linear regression help

Postby spssaltijdlastig » Wed May 01, 2013 9:09 am

I need to do a simple linear regression. But with constraints for the coefficient. The only way to do this is with the non linear regression method, right?
For example i have 2 variables:
dependent variable = return
independent variable = dy

But I want the coefficient to be larger than or equal to zero.
I don't know how to use syntax. And when I look at the normal route analyze>regression>nonlinear I get stuck.

the dependent variable is return.
but what is my model expression? something like b1 + b2*dy ?
and then I have to fill in the parameters. But I don't know what they mean by that. Nor what to fill in with starting value
and then i fill in the constraint: something like b2 >= 0

So the main problem is the parameters i guess.. Please help me out

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