Table 3. Correlation between estimated views.

	x 1	x 2	x 3	x 4	x 5	x 6	x 7
x 1	1.00	0.04	0.36	0.22	0.76	0.39	0.64
x 2	0.04	1.00	-0.03	0.95	-0.02	0.27	0.33
x 3	0.36	-0.03	1.00	0.01	0.73	0.24	0.30
x 4	0.21	0.95	0.01	1.00	0.08	0.33	0.48
x 5	0.76	-0.02	0.73	0.08	1.00	0.30	0.49
x 6	0.39	0.27	0.24	0.33	0.30	1.00	0.87
x 7	0.64	0.33	0.30	0.48	0.49	0.87	1.00