Simple Linear Path

To model linear degradation paths, select Degradation Path Style > Simple Linear Path from the platform red triangle menu.

Table 7.1 describes the options for the Simple Linear Path specification.

Table 7.1 Simple Linear Path Options
Option	Description
Intercept	Use this menu to specify the form of the intercept. Different fits a different intercept for each ID. Common in Group fits the same intercept for each ID in the same level of the X variable, and different intercepts between levels. Common fits the same intercept for all IDs. Zero restricts the intercept to be zero for all IDs.
Slope	Use this menu to specify the form of the slope. Different fits a different slope for each ID. Common in Group fits the same slope for each ID in the same level of the X variable, and different slopes between levels. Common fits the same slope for all IDs.
Reset Axes to Linear	Click this button to return the Overlay plot axes to their initial settings.
<Y, Response> Transformation	If a transformation on the Y variable can linearize the degradation path, select the transformation (Linear, ln(x), exp(x), x^2, sqrt(x) or Custom) here. For details about the Custom option, refer to Custom Transformations.
<Time> Transformation	If a transformation for the Time variable can linearize the degradation path, select the transformation (Linear, ln(x), x^2, sqrt(x) or Custom) here. For details about the Custom option, refer to Custom Transformations.
Generate Report for Current Model	Creates a report for the current model settings. This includes a Model Summary report, and Estimates report giving the parameter estimates. For more information, refer to Model Reports.

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.