How do I make my own SigmaPlot equation

The easiest way to create your own equation for regressions or plotting is not to make one from scratch (this is covered in the online help for the Regression Wizard), but to copy an existing equation, and edit that one. Copying a regression equation also allows you to edit the non-editable regions of the built-in equations.

To make a copy :

1. Open the Regression Wizard (F5), and open the Equation you want to use as the starting point for you own equation.

2. Click Edit Code. When the Function dialog box opens, click the Add As... button.

3. Rename the equation as desired, then click OK. The equation is added to your current Regression Library. If you are using the standard library, it is added under the User-Defined heading.

4. You can now edit the Equation and Parameters as desired. Make sure all parameters defined in the equation also appear in the Parameters box, or are defined as constants under in the Equation box.