User`s guide

Parametric Fitting
3-23
• 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.
Note that even if you define a linear equation, a nonlinear fitting procedure is
used. Although this is allowed by the toolbox, it is an inefficient process and can
result in less than optimal fitted coefficients. Instead, you should use the
Linear Equations pane to define the equation.
Specifying Fit Options
You specify fit options with the Fit Options GUI. The fit options for the
single-term exponential are shown below. The coefficient starting values and
constraints are for the census data.
The available GUI options depend on whether you are fitting your data using
a linear model, a nonlinear model, or a nonparametric fit type. All the options
described below are available for nonlinear models.
Method, Robust, and
coefficient constraints (
Lower and Upper) are available for linear models.
Interpolants and smoothing splines include
Method, but no configurable
options.
Fitting method and algorithm
Fit convergence criteria
Coefficient parameters
Finite differencing parameters