Quality and Reliability Methods - SAS

252 Lifetime Distribution II Chapter 14
Navigating the Fit Life by X Report Window
The Nested Model Tests include statistics and diagnostic plots for the Separate Location and Scale,
Separate Location, Regression, and No Effect models. To see results for each of the models
(independently of the other models), click the underlined model of interest (listed under the Nested Model
Tests outline title) and then uncheck the check boxes for the other models. Nested models are described in
Table 14.2. Separate Location and Scale, Separate Location, Regression, and No Effect models, using
a Weibull distribution for Devalt.jmp, are shown in Figure 14.14, Figure 14.15, Figure 14.16, and
Figure 14.17, respectively.
Table 14.2 Nested Models
Nested Models Description Example
Separate Location
and Scale
Separate Location
Regression
No Effect
Assumes that the location and scale parameters are
different for all levels of the explanatory variable and
is equivalent to fitting the distribution by the levels
of the explanatory variable. The Separate Location
and Scale Model has multiple location parameters
and multiple scale parameters.
Assumes that the location parameters are different,
but the scale parameters are the same for all levels of
the explanatory variable. The Separate Location
Model has multiple location parameters and only
one scale parameter.
Is the default model shown in the initial Fit Life by X
report window.
Assumes that the explanatory variable does not affect
the response and is equivalent to fitting all of the
data values to the selected distribution. The No
Effect Model has one location parameter and one
scale parameter.
Figure 14.14
Figure 14.15
Figure 14.16
Figure 14.17