Shared Concepts and Topics

When a continuous variable nests or crosses with a classification variable, the design columns are constructed by multiplying the continuous values into the design columns for the classification effect (Table 7).

Table 7: Example of Continuous-Nesting-Class Effects

Data			I		A			X(A)
X	A				A1	A2		X(A1)	X(A2)
21	1		1		1	0		21	0
24	1		1		1	0		24	0
22	1		1		1	0		22	0
28	2		1		0	1		0	28
19	2		1		0	1		0	19
23	2		1		0	1		0	23

This model estimates a separate intercept and a separate slope for X within each level of A.