Quality and Reliability Methods - SAS

Chapter 14 Lifetime Distribution II 251
Navigating the Fit Life by X Report Window
Figure 14.13 Weibull Distribution Nested Model Tests for Devalt.jmp Data
The Multiple Probability Plots shown in Figure 14.13 are used to validate the distributional assumption for
the different levels of the accelerating variable. If the line for each level does not run through the data points
for that level, the distributional assumption might not hold. See Meeker and Escobar (1998, sec. 19.2.2) for
a discussion of multiple probability plots.
The Cox-Snell Residual P-P Plot is used to validate the distributional assumption for the data. If the data
points deviate far from the diagonal, then the distributional assumption might be violated. See Meeker and
Escobar (1998, sec. 17.6.1) for a discussion of Cox-Snell residuals.