TheOrdinals: Aggregation and Consensus Methods for Preference-Approvals
Tools for aggregating ordinal preference data into a group
consensus. The package implements DIVA (Divide and Conquer for
Preference-Approvals), a distance-based aggregation method for
preference-approvals, that is, preference data in which voters express
both a (weak) ranking and an approval of the alternatives. The consensus
is the preference-approval minimising the average distance to the set of
voters, measured through the family of distances of Erdamar, Garcia-Lapresta,
Perez-Roman and Sanver (2014) <doi:10.1016/j.mathsocsci.2013.10.005>.
Methods and applications are described in Albano and Romano (2026)
<doi:10.1007/s11634-025-00663-4>. The package is designed to be extended
with further methods for ordinal preference data.
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