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Université de Fribourg

On the minimum and maximum selective graph coloring problems in some graph classes

Ries, Bernard

In: Discrete Applied Mathematics, 2016, vol. 204, p. 77-89

Given a graph together with a partition of its vertex set, the minimum selective coloring problem consists of selecting one vertex per partition set such that the chromatic number of the subgraph induced by the selected vertices is minimum. The contribution of this paper is twofold. First, we investigate the complexity status of the minimum selective coloring problem in some specific graph...

Université de Fribourg

Institutional effects on nurses’ working conditions: a multi-group comparison of public and private non-profit and for-profit healthcare employers in Switzerland

Aeschbacher, Remo ; Addor, Véronique

In: Human Resources for Health, 2018, vol. 16, no. 58, p. 1-10

Background: In response to the need for competitive recruitment of nurses resulting from the worldwide nursing shortage, employers need to attract and retain nurses by promoting their competitive strengths in their working conditions (WCS) and by addressing their competitive weaknesses. This study investigated workplace differences between public hospitals (PuHs), private for-profit hospitals...

Université de Fribourg

Comparative Law and Human Rights

Besson, Samantha

In: The Oxford Handbook of Comparative Law, 2nd ed., 2019, p. 1222-1249

Université de Fribourg

Article 2. The Right to Non-Discrimination

Besson, Samantha ; Kleber, Eleonor

In: The UN Convention on the Rights of the Child - A Commentary, 2019, p. 41-72

Université de Fribourg

Do Anti-Corruption Educational Campaigns Reach Students? : Evidence from Russia and Ukraine

Denisova-Schmidt, Elena ; Huber, Martin ; Leontyeva, Elvira

In: Educational studies. Moscow, 2016, no. 1, p. 61-83

The authors investigate the effect of anti-corruption educational materials — an informational folder with materials designed by Transparency International — on the willingness of students to participate in an anti-corruption campaign and their general judgment about corruption in two cities in Russia and Ukraine by conducting experiments. During a survey of 350 students in Khabarovsk,...

Public access from 20-feb-2021
Université de Fribourg

Classifying k-edge colouring for H-free graphs

Galby, Esther ; T. Lima, Paloma ; Paulusma, Daniël ; Ries, Bernard

In: Information procesing letters, 2019, vol. 146, p. 39-43

A graph is H-free if it does not contain an induced subgraph isomorphic to H. For every integer k and every graph H, we determine the computational complexity of k-Edge Colouring for H-free graphs.

Public access from 22-giu-2020
Université de Fribourg

Contraction and deletion blockers for perfect graphs and H-free graphs

Y. Diner, Öznur ; Paulusma, Daniël ; Picouleau, Christophe ; Ries, Bernard

In: Theoretical computer science, 2018, vol. 746, p. 49-72

We study the following problem: for given integers d, k and graph G, can we reduce some fixed graph parameter π of G by at least d via at most k graph operations from some fixed set S? As parameters we take the chromatic number χ, clique number ω and independence number α, and as operations we choose edge contraction ec and vertex deletion vd. We determine the complexity of this problem...

Université de Fribourg

Local Average Treatment Effects with or Without Defiers

Dahl, Christian M. ; Huber, Martin ; Mellace, Giovanni

In: Discussion papers on business and economics, 2017, vol. 2, p. 1-69

In heterogeneous treatment effect models with endogeneity, identification of the LATE typically relies on the availability of an exogenous instrument monotonically related to treatment participation. We demonstrate that a strictly weaker local monotonicity condition identifies the LATEs on compliers and on defiers. We propose simple estimators that are potentially more efficient than 2SLS,...

Université de Fribourg

Testing for covariate balance using quantile regression and resampling methods

Huber, Martin

In: Journal of applied statistics, 2011, vol. 38, no. 12, p. 2881-2899

Consistencyofpropensityscorematchingestimatorshingesonthepropensityscore’sabilityt obalancethe distributions of covariates in the pools of treated and non-treated units. Conventional balance tests merely check for differences in covariates’means, but cannot account for differences in higher moments. For this ...