Jaccard beta diversity metric

See also
beta_div command
Beta diversity metrics

The Jaccard metric between samples i and j is calculated as follows.

N = number of OTUs.

n _ki = count of OTU k in sample i .

S = sum k = 1 .. N of m in( n _ki , n _kj )

T = sum k = 1 .. N of m ax( n _ki , n _kj )

Jaccard = 1 - S / T