Théo Delemazure
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View article: Reallocating Wasted Votes in Proportional Parliamentary Elections with Thresholds
Reallocating Wasted Votes in Proportional Parliamentary Elections with Thresholds Open
International audience
View article: A Novel Sparse Active Online Learning Framework for Fast and Accurate Streaming Anomaly Detection Over Data Streams
A Novel Sparse Active Online Learning Framework for Fast and Accurate Streaming Anomaly Detection Over Data Streams Open
Online Anomaly Detection (OAD) is critical for identifying rare yet important data points in large, dynamic, and complex data streams. A key challenge lies in achieving accurate and consistent detection of anomalies while maintaining compu…
View article: Generalizing Instant Runoff Voting to Allow Indifferences
Generalizing Instant Runoff Voting to Allow Indifferences Open
Instant Runoff Voting (IRV) is used in elections for many political offices around the world. It allows voters to specify their preferences among candidates as a ranking. We identify a generalization of the rule, called Approval-IRV, that …
View article: Comparing Ways of Obtaining Candidate Orderings from Approval Ballots
Comparing Ways of Obtaining Candidate Orderings from Approval Ballots Open
To understand and summarize approval preferences and other binary evaluation data, it is useful to order the items on an axis which explains the data. In a political election using approval voting, this could be an ideological left-right a…
View article: Independence of Irrelevant Alternatives under the Lens of Pairwise Distortion
Independence of Irrelevant Alternatives under the Lens of Pairwise Distortion Open
We give a quantitative analysis of the independence of irrelevant alternatives (IIA) axiom. IIA says that the society's preference between x and y should depend only on individual preferences between x and y: we show that, in several conte…
View article: Aggregating Correlated Estimations with (Almost) no Training
Aggregating Correlated Estimations with (Almost) no Training Open
Many choice problems cannot be solved exactly and use several estimation algorithms that assign scores to the different available options. The estimation errors can have various correlations, from low (e.g. between two very different appro…
View article: Measuring a Priori Voting Power in Liquid Democracy
Measuring a Priori Voting Power in Liquid Democracy Open
We introduce new power indices to measure the a priori voting power of voters in liquid democracy elections where an underlying network restricts delegations. We argue that our power indices are natural extensions of the standard Penrose-B…
View article: Strategyproofness and Proportionality in Party-Approval Multiwinner Elections
Strategyproofness and Proportionality in Party-Approval Multiwinner Elections Open
In party-approval multiwinner elections the goal is to allocate the seats of a fixed-size committee to parties based on the approval ballots of the voters over the parties. In particular, each voter can approve multiple parties and each pa…
View article: Measuring a Priori Voting Power -- Taking Delegations Seriously
Measuring a Priori Voting Power -- Taking Delegations Seriously Open
We introduce new power indices to measure the a priori voting power of voters in liquid democracy elections where an underlying network restricts delegations. We argue that our power indices are natural extensions of the standard Penrose-B…
View article: Strategyproofness and Proportionality in Party-Approval Multiwinner Elections
Strategyproofness and Proportionality in Party-Approval Multiwinner Elections Open
In party-approval multiwinner elections the goal is to allocate the seats of a fixed-size committee to parties based on the approval ballots of the voters over the parties. In particular, each voter can approve multiple parties and each pa…
View article: Approval with Runoff
Approval with Runoff Open
We define a family of runoff rules that work as follows: voters cast approval ballots over candidates; two finalists are selected; and the winner is decided by majority. With approval-type ballots, there are various ways to select the fina…
View article: Liquid Democracy with Ranked Delegations
Liquid Democracy with Ranked Delegations Open
Liquid democracy is a novel paradigm for collective decision-making that gives agents the choice between casting a direct vote or delegating their vote to another agent. We consider a generalization of the standard liquid democracy setting…
View article: Liquid Democracy with Ranked Delegations
Liquid Democracy with Ranked Delegations Open
Liquid democracy is a novel paradigm for collective decision-making that gives agents the choice between casting a direct vote or delegating their vote to another agent. We consider a generalization of the standard liquid democracy setting…
View article: Démocratie à géométrie variable (à l'usage des algorithmes)
Démocratie à géométrie variable (à l'usage des algorithmes) Open
De nombreux problèmes, par exemple en décision, ne peuvent se résoudre de manière exacte et font appel à des heuristiques qui attribuent des scores aux différents choix possibles. Ces heuristiques peuvent être nombreuses et plus ou moins c…