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Comparing Analyses |
Select DRILTIME, then DEPTH, then METHOD in the data window. |
Choose Analyze:Fit (Y X). |
A fit window appears, as shown in Figure 21.15.
Choose Edit:Windows:Copy Window. |
Now you have two identical fit windows.
Select METHOD in one of the fit windows. |
Choose Edit:Delete. |
This recalculates the fit window without the effect you deleted.
Now you have two fit windows for two different models.
Deleting METHOD caused the adjusted R-square value to drop from 0.4218 to 0.3332. It was expected that different drilling methods might produce different drilling times.
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