https://community.jmp.com/t5/Discussions/Curve-fitting-on-Data-with-three-variable-X-Y-Z/m-p/539#M539 Use the "Fit Model" platform. Add column Y to "Y" and columns X and Z to "Model Effects". To add powers of independent variables choose "Polynomial to Degree" under the "Macros" roll list. When you're done just hit "Run Model". Tue, 23 Jun 2009 12:22:01 GMT ms 2009-06-23T12:22:01Z https://community.jmp.com/t5/Discussions/Curve-fitting-on-Data-with-three-variable-X-Y-Z/m-p/538#M538 I have data with 3 variables X,Y,Z and i want to fit a model like ...<BR />Y= a(x) + b(z)+c, <BR />X and Z may have some powers (n) also.How to do it? Please guide Mon, 22 Jun 2009 21:24:31 GMT https://community.jmp.com/t5/Discussions/Curve-fitting-on-Data-with-three-variable-X-Y-Z/m-p/538#M538 2009-06-22T21:24:31Z https://community.jmp.com/t5/Discussions/Curve-fitting-on-Data-with-three-variable-X-Y-Z/m-p/539#M539 Use the "Fit Model" platform. Add column Y to "Y" and columns X and Z to "Model Effects". To add powers of independent variables choose "Polynomial to Degree" under the "Macros" roll list. When you're done just hit "Run Model". Tue, 23 Jun 2009 12:22:01 GMT https://community.jmp.com/t5/Discussions/Curve-fitting-on-Data-with-three-variable-X-Y-Z/m-p/539#M539 ms 2009-06-23T12:22:01Z https://community.jmp.com/t5/Discussions/Curve-fitting-on-Data-with-three-variable-X-Y-Z/m-p/540#M540 Is there a way to determine the resulting formula? Will this same setup work for surface fitting? Wed, 05 Aug 2009 22:22:09 GMT https://community.jmp.com/t5/Discussions/Curve-fitting-on-Data-with-three-variable-X-Y-Z/m-p/540#M540 2009-08-05T22:22:09Z https://community.jmp.com/t5/Discussions/Curve-fitting-on-Data-with-three-variable-X-Y-Z/m-p/541#M541 Under the top red triangle, under Save Columns, you can select Prediction Formula option. Mon, 10 Aug 2009 13:30:35 GMT https://community.jmp.com/t5/Discussions/Curve-fitting-on-Data-with-three-variable-X-Y-Z/m-p/541#M541 2009-08-10T13:30:35Z