NLR Command Additional Features

The command syntax language also allows you to:

• Name a file from which to read initial values for parameter estimates.
• Specify more than one model statement and loss function. This makes it easier to specify a segmented model.
• Supply your own derivatives rather than use those calculated by the program.
• Specify the number of bootstrap samples to generate.
• Specify additional iteration criteria, including setting a critical value for derivative checking and defining a convergence criterion for the correlation between the residuals and the derivatives.

Additional criteria for the CNLR (constrained nonlinear regression) command allow you to:

• Specify the maximum number of minor iterations allowed within each major iteration.
• Set a critical value for derivative checking.
• Set a step limit.
• Specify a crash tolerance to determine if initial values are within their specified bounds.