I would like to apply a restriction on the coefficients of a linear regression (OLS). Indeed, coefficients will represent the yield of a crop (soybeans, corn…) for a specific grade (my data) during its lifecycle.

How can I apply a restriction on coefficients: I want them to be all positive and that the first coefficient (grade poor crop) is lower than the second (grade fair crop), the second coefficient lower than the third (grade good crop)…

Thanks in advance

JCB 

French gretl user

 



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