User`s guide

3 Fitting Data
3-22
• Equation — The custom equation.
•
Equation name — The name of the equation. By default, the name is
automatically updated to be identical to the custom equation given by
Equation. If you override the default, the name is no longer automatically
updated.
General Equations
General (nonlinear) equations are defined as equations that are nonlinear in
the parameters, or are a combination of linear and nonlinear in the
parameters. For example, the exponential library equations are nonlinear. The
General Equations pane is shown below followed by a brief description of its
parameters.
•
Independent variable — Symbol representing the independent (predictor)
variable. The default symbol is
x.
•
Equation — Symbol representing the dependent (response) variable
followed by the general equation. As you type in the terms of the equation,
the unknown coefficients, associated starting values, and constraints
automatically populate the table. By default, the starting values are
randomly selected on the interval [0,1] and are unconstrained.
You can immediately change the default starting values and constraints in
this table, or you can change them later using the Fit Options GUI.