Consider the following four correlation matrices that apply to clusters having five responses per cluster:
a.

b.

c.

d.

a. Matrix A is an example of what kind of correlation structure?
b. Matrix B is an example of what kind of correlation structure?
c. Matrix C is an example of what kind of correlation structure?
d. Matrix D is an example of what kind of correlation structure?

1 0.6 0.45 0.39 0.25 0.6 0.43 0.51 0.35 0.45 0.43 0.29 0.22 0.39 0.51 0.0.53 L0.25 0.35 0.22 3 1 00001 00010 00-00 01000 10000 0.50 0.25 0.125 00625-1 0.50 0.50 0.25 0.125 0.25 0.50 .50 0.25 0.125 0.25 0.500.50 0.0625 0.125 0.25 0.50 1 1 0.46 0.46 0.46 0.46 0.46 1 0.46 0.46 0.46 0.46 0.46 10.46 0.46 0.46 0.46 0.46 1 0.46 0.46 0.46 0.46 0.46 1