17 June 2004
Daylight CIS UK Ltd
A note on singletons
In a parametric world singletons are thought of as
outliers, ‘distant’ from other
members of the set
In the non-parametric world the idea of singletons is not
necessarily so intuitive as every object has the same
number of neighbours.
Singletons i.e. objects that fail to cluster, can arise from
two causes in Jarvis-Patrick corresponding to the two
If the object has none of its
neighbours in common with any
other object it will remain a singleton.
If there are
neighbours in common, when
then it too will
fail to cluster.