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 to be used in your design. Your data table is Torque Prior.jmp, found in the Sample Data Library.
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Select Analyze > Reliability and Survival > Fit Life by X.
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Enter 35 for the Use Condition.
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Figure 21.2 Fit Life by X Launch Window
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Click OK.
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Figure 21.3 Fit Life by X Model for Prior Data
The model for the mean is given in the Estimates outline. 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 outline. Use these parameter estimates and their covariances as your prior values when you construct your ALT design.