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. 2014 Nov 5;9(11):e111988. doi: 10.1371/journal.pone.0111988

Table 4. Seven distances for the clustering.

Distance Equation
Euclidean distance Inline graphic
Squared Euclidean distance Inline graphic
Manhattan distance Inline graphic
Maximum distance Inline graphic
Pearson distance (default) Inline graphic
Spearman distance Inline graphic
Kendall's tau distance Inline graphic

To calculate the distances for the hierarchical and k-means clustering approaches, up to 7 mostly used distances were adopted.