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Minitab provides three main distributions—normal, logistic, and extreme value—which allow you to fit a broad class of binary response models. You can take the log of the stress to obtain the lognormal, loglogistic, and Weibull distributions, respectively. When there is no factor, the following equation describes this class of models:
πj = c + (1 − c) g(β0 + xjβ)
| Term | Description |
|---|---|
| πj | the probability of a response for the jth stress level |
| g(yj) | the cumlative distribution function for the distribution in the model (for more information, go to the Distribution functions topic) |
| β0 | the constant term |
| xj | the jth level of the stress variable |
| β | unknown coefficient associated with the stress variable |
| c | natural response rate |
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