Fig. 2.

External clustering indices. The average of the calculated indices with SD (Standard Deviation) bars are shown graphically in the five clustering algorithms. As shown, the MCL outperformed in all the indices including even the Rand index with argued imperfection. Note that the range of the Minkowski index is [0, +∞) and the values (here is MCL) near to zero indicate the more similarity. But the other indices range is [0, 1] and the values near to zero specify the less similarity