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adel_hassanvand
adel_hassanvand
Level I

curve fit for multi variables equation

Oct 13, 2014 04:19 AM (5930 views)

I have some results, I want to use curve fit to find the equation which can describe the relation between the variables.I have three(3) variables so the equation should has this format " y=f( x1, x2, x3 ) " . I would be appreciate if you lead me how can I use curve fit to find an equation with three variables?

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2 REPLIES 2
Steven_Moore
Steven_Moore
Level VI

Re: curve fit for multi variables equation

Oct 13, 2014 11:47 AM (5724 views)  |  Posted in reply to message from adel_hassanvand 10-13-2014

Adel,  I would start with the "Fit Model" platform and discover the best equation for y=f(X1, X2, X3).  Then, it will be a pretty easy exercise to plot your data on a 3-D graph.

Steve
Bill_Worley
Staff Bill_Worley
Staff

Re: curve fit for multi variables equation

Oct 22, 2014 08:38 AM (5724 views)  |  Posted in reply to message from adel_hassanvand 10-13-2014

Adel,

Have you fit the model and then saved the prediction formula?  If so, you can go to your data table and right click on the column header for the prediction formula and then select "Formula" from the list.  This will show the formula in the format you suggest above, keeping in mind that Y is implied.  If you want to see how predictive your model is go to the Fit YbyX platform and then put the original Y data in Y Response and the saved prediction formula in X Factor and click OK.  You can then go to the red hot spot by Bivariate fit and select Fit Line to get fit statistics.