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![Restricted least squares regression in SAS](https://blogs.sas.com/content/iml/files/2020/09/restrictedReg3-614x336.png)
A data analyst recently asked a question about restricted least square regression in SAS. Recall that a restricted regression puts linear constraints on the coefficients in the model. Examples include forcing a coefficient to be 1 or forcing two coefficients to equal each other. Each of these problems can be