When the report is run, the Cumulative Events plot updates to show the piecewise model. Blue vertical dashed lines show the transition times for each of the phases. The Model List also updates. See Cumulative Events Plot and Model List Report, where both a Crow-AMSAA model and a piecewise Weibull NHPP model have been fit to the data in TurbineEngineDesign1.jmp. Note that both models are compared in the Model List report.
Cumulative Events Plot and Model List Report
Piecewise Weibull NHPP Report
The MTBF plot and the Estimates report appear by default when the Piecewise Weibull NHPP option is chosen (Piecewise Weibull NHPP Report). When Time to Event Format is used, the axes are logarithmically scaled. For further details about the plot, see MTBF Plot.
The Estimates report gives estimates of the model parameters. Note that only the estimate for the value of λ corresponding to the first phase is given. In the piecewise model, the cumulative events at the end of one phase must match the number at the beginning of the subsequent phase. Because of these constraints, the estimate of λ for the first phase and the estimates of the βs determine the remaining λs.
It is important to note that, due to the default resolution of the profiler plot, discontinuities are not displayed clearly in the MTBF or Failure Intensity Profilers. In the neighborhood of a phase transition, the profiler trace shows a nearly vertical, but slightly sloped, line; this line represents a discontinuity. (See Profilers.) Such a line at a phase transition should not be used for estimation. You can obtain a higher-resolution display making these lines appear more vertical as follows. Press Ctrl while clicking in the profiler plot, and then enter a larger value for Number of Plotted Points in the dialog window. (See Factor Settings Window, where we have specified 500 as the Number of Plotted Points.)
Factor Settings Window

Help created on 9/19/2017