Quality and Reliability Methods - SAS

Chapter 14 Lifetime Distribution II 245
Navigating the Fit Life by X Report Window
You can also remove density curves and quantile lines, as desired, by selecting either Remove Density
Curves or Remove Quantile Lines in the drop-down menu under Scatterplot. (See Figure 14.6.) Density
curve values previously entered are shown in the Remove Density Curves window and quantile values
previously entered are shown in the Remove Quantile Lines window. Curves and lines are removed by
checking the appropriate check box.
Figure 14.6 Scatterplot Remove Menus
Nonparametric Overlay
The Nonparametric Overlay plot is the second item shown in the report window (after Scatterplot).
Figure 14.7 shows this plot. Differences among groups can readily be detected by examining this plot. You
can view these differences for Hours on different scales. You can also change the interval type between
Simultaneous and Pointwise.
Wilcoxon Group Homogeneity Test
For this example, the Wilcoxon Group Homogeneity Test, shown in Figure 14.7, indicates that there is a
difference among groups. The high ChiSquare value and low p-value are consistent with the differences seen
among the Temp groups in the Nonparametric Overlay plot.