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)


πjthe probability of a response for the jth stress level
g(yj) the distribution function (for more information, go to the Distribution functions topic)
β0the constant term
xjthe jth level of the stress variable
βunknown coefficient associated with the stress variable
c natural response rate
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