IBM Data WH Generalized Linear Model Options - Interaction

The Interaction panel contains the options for specifying interactions (that is, multiplicative effects between input fields).

Column Interaction. Select this check box to specify interactions between input fields. Leave the box cleared if there are no interactions.

Enter interactions into the model by selecting one or more fields in the source list and dragging to the interactions list. The type of interaction created depends upon the hotspot onto which you drop the selection.

  • Main. Dropped fields appear as separate main interactions at the bottom of the interactions list.
  • 2-way. All possible pairs of the dropped fields appear as 2-way interactions at the bottom of the interactions list.
  • 3-way. All possible triplets of the dropped fields appear as 3-way interactions at the bottom of the interactions list.
  • *. The combination of all dropped fields appear as a single interaction at the bottom of the interactions list.

Include Intercept. The intercept is usually included in the model. If you can assume the data passes through the origin, you can exclude the intercept.

Dialog box buttons

The buttons to the right of the display enable you to make changes to the terms used in the model.

Figure 1. Delete button
Delete button

Delete terms from the model by selecting the terms you want to delete and clicking the delete button.

Figure 2. Reorder buttons
Reorder buttons

Reorder the terms within the model by selecting the terms you want to reorder and clicking the up or down arrow.

Figure 3. Custom interaction button
Custom interaction button