Fractional approval voting

In fractional social choice, fractional approval voting refers to a class of electoral systems using approval ballots (each voter selects one or more candidate alternatives), in which the outcome is fractional: for each alternative j there is a fraction pj between 0 and 1, such that the sum of pj is 1. It can be seen as a generalization of approval voting: in the latter, one candidate wins (pj = 1) and the other candidates lose (pj = 0).

Source: Wikipedia — Fractional approval voting (CC BY-SA 4.0)