Quality and Reliability Methods - SAS

284 Degradation Chapter 16
Model Specification
Table 16.2 Simple Linear Path Options (Continued)
Option
Generate Report for
Current Model
Description
Creates a report for the current model settings. This includes a Model
Summary report, and Estimates report giving the parameter estimates. For
more information, see “Model Reports” on page 296.
Custom Transformations
If you need to perform a transformation that is not given, use the Custom option. For example, to
transform the response variable using exp(-x 2 ), enter the transformation as shown in the Scale box in
Figure 16.5. Also, enter the inverse transformation in the Inverse Scale box.
Note: JMP automatically attempts to solve for the inverse transformation. If it can solve for the inverse, it
automatically enters it in the Inverse Scale box. If it cannot solve for the inverse, you must enter it manually.
Figure 16.5 Custom Transformation Options
Name the transformation using the text box. When finished, click the Use & Save button to apply the
transformation. Select a transformation from the menu if you have created multiple custom
transformations. Click the Delete button to delete a custom transformation.
Nonlinear Path
To model nonlinear degradation paths, select Degradation Path Style > Nonlinear Path from the platform
red triangle menu. This is useful if a degradation path cannot be linearized using transformations, or if you
have a custom nonlinear model that you want to fit to the data.