Deleting Variables

Comparing Analyses

Deleting Variables

You can delete any effect in a fit analysis. To see this, do the following:

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.

Figure 21.15: Fit Window

Choose Edit:Windows:Copy Window.

Now you have two identical fit windows.

Select METHOD in one of the fit windows.

Figure 21.16: Two Fit Windows, METHOD Selected in One

Choose Edit:Delete.

This recalculates the fit window without the effect you deleted. Now you have two fit windows for two different models.

Figure 21.17: Comparing Two 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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