Fig. 8.

Borderline nonremovable interactions. These interactions are on the cusp between removable and nonremovable. Theoretically, these interactions are nonremovable, but in practice their classification hinges on the statistical evidence in favor of a point-null hypothesis. Note that the top-left panel features two lines that overlap. Note: A1 and A2 refer to two levels of factor A; B1 and B2 refer to two levels of factor B. Within each column, the top graph plots factor A on the x-axis, and the corresponding bottom graph plots factor B on the x-axis