No.

error term

Centroid method

Diamond

Sakawa-Yano

1

(1.5, 2.0, 2.5)

(3.5, 4.0, 4.5)

0.848

0.861

0.633

2

(3.0, 3.5, 4.0)

(5.0, 5.5, 6.0)

0.208

0.227

0.453

3

(4.5, 5.5, 6.5)

(6.5, 7.5, 8.5)

1.489

1.520

1.613

4

(6.5, 7.0, 7.5)

(6.0, 6.5, 7.0)

0.910

0.945

1.165

5

(8.0, 8.5, 9.0)

(8.0, 8.5, 9.0)

0.760

0.785

0.770

6

(9.5, 10.5, 11.5)

(7.0, 8.0, 9.0)

1.449

1.477

1.977

7

(10.5, 11.0, 11.5)

(10.0, 10.5, 11.0)

1.000

1.060

1.368

8

(12.0, 12.5, 13.0)

(9.0, 9.5, 10.0)

0.806

0.834

1.452

The sum of error t error term

7.470

7.709

9.431