Modeling and Multivariate Methods - SAS

266 Performing Nonlinear Regression Chapter 9
Fit a Custom Model
The Reset button sets the initial values of parameters back to their default values.
Click Show Points to overlay the actual data points to the plot. The dialog in Figure 9.16 opens, asking
you to assign columns into X and Y roles, and an optional Group role. The Group role allows for fitting the
model to every level of a categorical variable. If you specify a Group role here, also specify the Group
column on the platform launch window (Figure 9.16).
Figure 9.16 Roles
For most models, the starting values are constants. Showing points enables you to adjust the parameter
values to see how well the model fits for different values of the parameters. For the US population example,
the points are shown in Figure 9.17.
Figure 9.17 Show Points