Category j at time t1

Category i at time t0

Category i 1 (j = 1)

Category i 1 (j = 1)

category i 1 (j = 1)

Sum of the Ejt1 of the columns

Category i 1 (i = 1)

a(1.1)

a(1.2)

a(1.3)

∑a(1.j), j = 1.n

Category i 1 (i = 2)

a(2.1)

a(2.2)

a(2.3)

∑a(2.j), j = 1.n

Category i 1 (i = 3)

a(3.1)

a(3.2)

a(3.3)

∑a(3.j), j = 1.n

Sum of the Ejt1 of the columns

∑a(i.1), i = 1.m

∑a(i.2), i = 1.m

∑a(i.3), i = 1.m

∑∑a(i.3), j = 1.m