https://communities.sas.com/t5/SAS-Procedures/PROC-NLIN-force-intercept/m-p/62231#M17702 I can think of at least two ways. First, do not specify it as a parameter, but instead write the model with the "forced" value in place. Second, let it be a parameter, but use the BOUNDS statement to restrict the value.<BR /> <BR /> Good luck.<BR /> <BR /> Steve Denham Thu, 06 Aug 2009 19:06:24 GMT SteveDenham 2009-08-06T19:06:24Z https://communities.sas.com/t5/SAS-Procedures/PROC-NLIN-force-intercept/m-p/62230#M17701 Does anybody know how to force the intercept in proc nlin? Thu, 06 Aug 2009 18:13:14 GMT https://communities.sas.com/t5/SAS-Procedures/PROC-NLIN-force-intercept/m-p/62230#M17701 deleted_user 2009-08-06T18:13:14Z https://communities.sas.com/t5/SAS-Procedures/PROC-NLIN-force-intercept/m-p/62231#M17702 I can think of at least two ways. First, do not specify it as a parameter, but instead write the model with the "forced" value in place. Second, let it be a parameter, but use the BOUNDS statement to restrict the value.<BR /> <BR /> Good luck.<BR /> <BR /> Steve Denham Thu, 06 Aug 2009 19:06:24 GMT https://communities.sas.com/t5/SAS-Procedures/PROC-NLIN-force-intercept/m-p/62231#M17702 SteveDenham 2009-08-06T19:06:24Z