method
the distance measure to be used. This must be one of
"euclidean", "maximum", "manhattan",
"canberra" "binary" "pearson",
"correlation" or "spearman".
Any unambiguous substring can be given.
link
the agglomeration method to be used. This should
be (an unambiguous abbreviation of) one of
"ward", "single", "complete",
"average", "mcquitty", "median" or
"centroid".