Custom Relationship Example | JMP 13.2

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Reliability and Survival Methods • Fit Life by X • Additional Examples of the Fit Life by X Platform • Custom Relationship Example

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Custom Relationship Example

To create a quadratic model with Log(Temp) for the Weibull location parameter and a log-linear model with Log(Temp) for the Weibull scale parameter, follow these steps:

1.

Select Help > Sample Data Library and open Reliability/Devalt.jmp.

2.

Select Analyze > Reliability and Survival > Fit Life by X.

3.

Select Hours and click Y, Time to Event, Temp and click X, Censor and click Censor, and Weight and click Freq.

4.

Select Custom as the Relationship from the list.

5.

In the entry field for μ, enter 1, log(:Temp), log(:Temp)^2.

(The 1 indicates that an intercept is included in the model.)

6.

In the entry field for σ, enter 1, log(:Temp).

7.

Select the check box for Use Exponential Link.

8.

Deselect the check box for Nested Model Tests.

9.

In the entry field for Baseline, enter 10.

10.

Select Weibull as the Distribution.

Custom Relationship Specification in Fit Life by X Launch Window shows the completed launch window using the Custom option.

Note: The Nested Model Tests check box is not checked for non-constant scale models. Nested Model test results are not supported for this option.

11.

Custom Relationship Specification in Fit Life by X Launch Window

Weibull Estimates and Formulas for Custom Relationship shows the location and scale transformations, which are subsequently created and included at the bottom of the Estimates report section.

Analysis proceeds similarly to the Example of the Fit Life by X Platform, where the Arrhenius Celsius Relationship was specified.

Weibull Estimates and Formulas for Custom Relationship

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Help created on 9/19/2017