Graphical depiction of three possible interactions between predictor terms X1 and X2 (AND, OR, and XOR) that can be encoded by the design matrix Z. Values of β· Z range from 0 (red) to 1 (white). The interactions are encoded by specific linear combinations of X1, X2 and min(X1, X2), using the coefficients (three elements in the vector β) for the individual components (Table 2).
Bonneau et al. Genome Biology 2006 7:R36 doi:10.1186/gb-2006-7-5-r36