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Université de Fribourg

OpenCrowd : A Human-AI Collaborative Approach for Finding Social Influencers via Open-Ended Answers Aggregation

Arous, Ines ; Yang, Jie ; Khayati, Mourad ; Cudré-Mauroux, Philippe

In: WWW '20: Proceedings of The Web Conference 2020, 2020, vol. April, p. 1851-1862

Finding social influencers is a fundamental task in many online applications ranging from brand marketing to opinion mining. Existing methods heavily rely on the availability of expert labels, whose collection is usually a laborious process even for domain experts. Using open-ended questions, crowdsourcing provides a cost-effective way to find a large number of social influencers in a short...

Université de Fribourg

Endogeneity and non-response bias in treatment evaluation – nonparametric identification of causal effects by instruments

Fricke, Hans ; Frölich, Markus ; Huber, Martin ; Lechner, Michael

In: Journal of Applied Econometrics, 2020, p. 481-504

This paper proposes a nonparametric method for evaluating treatment effects in the presence of both treatment endogeneity and attrition/non-response bias, based on two instrumental variables. Using a discrete instrument for the treatment and an instrument with rich (in general continuous) support for non-response/attrition, we identify the average treatment effect on compliers as well as the...

Université de Fribourg

Cenozoic evolution of the steppe-desert biome in Central Asia

Barbolini, N. ; Woutersen, A. ; Dupont-Nivet, G. ; Silvestro, Daniele ; Tardif, D. ; Coster, P. M. C. ; Meijer, N. ; Chang, C. ; Zhang, H.-X. ; Licht, A. ; Rydin, C. ; Koutsodendris, A. ; Han, F. ; Rohrmann, A. ; Liu, X.-J. ; Zhang, Y. ; Donnadieu, Y. ; Fluteau, F. ; Ladant, J.-B. ; Le Hir, G. ; Hoorn, C.

In: Science Advances, 2020, vol. 6, no. 41, p. eabb8227

The origins and development of the arid and highly seasonal steppe-desert biome in Central Asia, the largest of its kind in the world, remain largely unconstrained by existing records. It is unclear how Cenozoic climatic, geological, and biological forces, acting at diverse spatial and temporal scales, shaped Central Asian ecosystems through time. Our synthesis shows that the Central Asian...

Consortium of Swiss Academic Libraries

The last erosional stage of the Molasse Basin and the Alps

Schlunegger, Fritz ; Mosar, Jon

In: International Journal of Earth Sciences, 2011, vol. 100, no. 5, p. 1147-1162