Quality and Reliability Methods - SAS

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242 Lifetime Distribution II Chapter 14 Navigating the Fit Life by X Report Window Fit Frechet fits a Fréchet distribution to the data. Fit Exponential fits an exponential distribution to the data. Fit SEV fits an SEV distribution to the data. Fit Normal Fit Logistic fits a normal distribution to the data. fits a logistic distribution to the data. Fit LEV fits an LEV distribution to the data. Fit All Distributions fits all distributions to the data. Set Time Acceleration Baseline enables you to enter a baseline value for the explanatory variable of the acceleration factor in a popup window. Change Confidence Level Lets you enter a desired confidence level, for the plots and statistics, in a popup window. The default confidence level is 0.95. Tabbed Report Lets you specify how you want the report window displayed. Two options are available: Tabbed Overall Report and Tabbed Individual Report. Tabbed Individual Report is checked by default. Show Surface Plot toggles the surface plot for the distribution on and off in the individual distribution results section of the report. The surface plot is shown in the Distribution, Quantile, Hazard, and Density sections for the individual distributions, and it is on by default. Show Points toggles the data points on and off in the Nonparametric Overlay plot and in the Multiple Probability Plots. The points are shown in the plots by default. If this option is unchecked, the step functions are shown instead. Navigating the Fit Life by X Report Window The initial report window includes the following outline nodes: • “Summary of Data” on page 243 • “Scatterplot” on page 243 • “Nonparametric Overlay” on page 245 • “Wilcoxon Group Homogeneity Test” on page 245 • “Comparisons” on page 246 (Distribution, Quantile, Hazard, Density, and Acceleration Factor profilers, along with criteria values under Comparison Criterion can be viewed and compared.) • “Results” on page 250 (Parametric estimates, covariance matrices, and nested model tests can be examined and compared for each of the selected distributions.)
Chapter 14 Lifetime Distribution II 243 Navigating the Fit Life by X Report Window Summary of Data Scatterplot The Summary of Data report gives the total number of observations, the number of uncensored values, and the number of censored values (right, left, and interval). The Scatterplot of the lifetime event versus the explanatory variable is shown at the top of the report window. For the Devalt data, the Scatterplot shows Hours versus Temp. Table 14.1 indicates how each type of failure is represented on the Scatterplot in the report window. Table 14.1 Scatterplot Representation for Failure and Censored Observations Event failure right-censoring left-censoring interval-censoring Scatterplot Representation dots upward triangles downward triangles downward triangle on top of an upward triangle, connected by a solid line Using Scatterplot Options Density curves and quantile lines for each group can be specified by clicking on the red-triangle menu for the scatterplot. You can select the Show Density Curves option to display the density curves. If the Location or the Location and Scale model is fit, or if Nested Model Tests is checked in the launch window, then the density curves for all of the given explanatory variable levels are shown. You can select the Add Density Curve option, where you can specify the density curve that you want, one at a time, by entering any value within the range of the accelerating factor. After the curves have been created, the Show Density Curves option toggles the curves on and off the plot. Similarly, you can specify which quantile lines you want by selecting Add Quantile Lines, where you enter three quantiles of interest, at a time. You can add more quantiles by continually selecting the Add Quantile Lines. Default quantile values are 0.1, 0.5, and 0.9. Invalid quantile values, like missing values, are ignored. If desired, you can enter just one quantile value, leaving the other entries blank. Figure 14.4 shows the initial scatterplot; Figure 14.5shows the resulting scatterplot with the Show Density Curves and Add Quantile Lines options selected. To swap the X and Y axes, select the Transpose Axes option. The default view of the scatterplot incorporates the transformation scale. Turn off this option by selecting Use Transformation Scale.
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Chapter 19 Reliability and Survival
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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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