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** <http://www.roquette.com/> French gretl user __ --------------------------------------------------------------- The information in this e-mail and any attachment is intended for the addressee(s) only. It may contain confidential and/or privileged information. Access, disclosure, copying, distribution or reliance on any of it by anyone else is prohibited and may be a criminal offence. The contents do not represent the opinion of ROQUETTE FRERES or any of its affiliated companies except to the extent that it relates to their official business. If you received this in error, please notify the sender and delete the contents from any computer on which they are stored. --------------------------------------------------------------- _______________________________________________ Gretl-users mailing list Gretl-users(a)lists.wfu.edu http://lists.wfu.edu/mailman/listinfo/gretl-users