Following the approach outlined above, you create a data table containing estimates of the number of failure cycles for a balanced design. Your table consists of five units at each of the three stress levels that you will use in your design. Your data table is Torque Prior.jmp, found in the Design Experiment sub folder.
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Select Analyze > Reliability and Survival > Fit Life by X.
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Click OK.
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The model for the mean is given in the Estimates report. The Estimate column contains the parameter estimates for the intercept (β0), the linear coefficient (β1), and the scale (σ). The estimated variances and covariances for the parameter estimates are given in the Covariance Matrix report. You will use these parameter estimates and their covariances as your prior values in constructing your ALT design.