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A general description is here.
‘hclust()’ gains a new method ‘"ward.D2"’ which implements Ward's method correctly. The previous ‘"ward"’ method is ‘"ward.D"’ now, with the old name still working. Thanks to research and proposals by Pierre Legendre.
The ‘sunspot.month’ dataset has been amended and updated from the official source, whereas ‘sunspots’ and ‘sunspot.year’ will remain immutable, and the docs and source links have been updated correspondingly.