Use the Profiler, Contour Profiler, or Surface Profiler to gain further insight into the fitted model. To select a profiler option, click on the red triangle menu next to Loglinear Variance Fit and select one of the options under the Profilers menu.
1.
Open the InjectionMolding.jmp sample data table.
2.
Select Analyze > Fit Model.
3.
Click Run.
Prediction Intervals
MoldTemp to 0.2
Hold Time to -1
Profiler to Match Target and Minimize Variance
If Y is the modeled response, and you want a prediction interval for a new observation at xn, then:
s2|xn is the variance for the individual prediction at xn
s2Y|xn is the variance of the distribution of Y at xn
Because the variance of the individual prediction contains the variance of the distribution of Y, the effects of the changing variance for Y can be seen. Not only are the individual prediction intervals wider, but they can change shape with a change in the variance effects.