jaccard: Compute Jaccard distance on a data matrix
Description
Computes Jaccard distances between the columns of a 0-1-matrix.
Details
Missing values are allowed, and are excluded from all computations
involving the cols within which they occur.
References
Jaccard, P. (1908), Nouvelles recherches sur la distribution
lorale, Bull. Soc. Vaud. Sci. Nat., 44, 223-270.