Quality and Reliability Methods - SAS

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332 Reliability Growth Chapter 18 Fit Model Options Figure 18.9 Intensity Plot Show Cumulative Events Plot This plot shows the estimated cumulative number of events (Figure 18.10). The observed cumulative numbers of events are also displayed on this plot. If Time to Event Format is used, both axes are scaled logarithmically. Figure 18.10 Cumulative Events Plot For the Crow-AMSAA model, the cumulative number of events at time t is given by λt β . It follows that the logarithm of the cumulative number of events is a linear function of log(t). So, the plot of the estimated Cumulative Events is linear when plotted against logarithmically scaled axes.
Chapter 18 Reliability Growth 333 Fit Model Options Show Profilers Three profilers are displayed, showing estimated MTBF, Failure Intensity, and Cumulative Events (Figure 18.11). These profilers do not use logarithmic scaling. By dragging the red vertical dashed line in any profiler, you can explore model estimates at various time points; the value of the selected time point is shown in red beneath the plot. Also, you can set the time axis to a specific value by pressing the CTRL key while you click in the plot. A blue vertical dashed line denotes the time point of the last observed failure. The profilers also display 95% confidence bands for the estimated quantities. For the specified time setting, the estimated quantity (in red) and 95% confidence limits (in black) are shown to the left of the profiler. For further details, see “Profilers” on page 347. Note that you can link these profilers by selecting Factor Settings > Link Profilers from any of the profiler red triangle menus. For further details about the use and interpretation of profilers, see Modeling and Multivariate Methods, Fitting Standard Least Squares Models, Factor Profiling, The Profiler. Figure 18.11 Profilers Achieved MTBF A confidence interval for the MTBF at the point when testing concludes is often of interest. For uncensored failure time data, this report gives an estimate of the Achieved MTBF and a 95% confidence interval for the Achieved MTBF. You can specify a 100*(1-α)% confidence interval by entering a value for Alpha. The report is shown in Figure 18.12. For censored data, only the estimated MTBF at test termination is reported.
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References Abernethy, Robert B. (19
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References 407 Carroll, R.J., Ruppe
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References 409 Haaland, P.D. (1989)
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References 411 Lawless, J.F. (1982)
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References 413 Nelson, W.B. (2003),
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References 415 Snee, R.D. and Marqu
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Index JMP Quality and Reliability M
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Index 419 Fit SEV 242 Fit Weibull 2
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Index 421 Q Quantiles table 356 R R
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Index 423 Weibull Plot 360 Westgard
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Quality and Reliability Methods - SAS

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