Suchergebnisse

In this talk I introduce Transcendental Information Cascades, a method to understand the temporal dynamics of naturally occurring complex systems through the lens of a specific kind of spatio-temporal network that represents information token recurrence. The method suits very well for exploratory data analysis when it is unknown what is going on at the very low levels of a system's dynamics, and allows switching between looking at individual events or accumulated event sequences. I will present one application of this method in a digital humanities project where we analysed the entire corpus of Charles Dickens's novels and discuss the potential it has for other application areas such as the analysis of brain wave recordings, patent mining or the study of online communities for example. These are the slides of a talk at the RWTH Aachen University, Chair for Computational Social Sciences and Humanities (Germany, date of the talk 06-03-2018) {"references": ["Popper, K., 2013. Knowledge and the Body-Mind Problem: In defence of interaction. Routledge.", "Berners-Lee, Tim; Mark Fischetti (1999). Weaving the Web: The Original Design and Ultimate Destiny of the World Wide Web by its inventor. Britain: Orion Business. ISBN 0-7528-2090-7.", "Luczak-Roesch, M., Tinati, R., Simperl, E., Van Kleek, M., Shadbolt, N., & Simpson, R. (2014). Why won't aliens talk to us? Content and community dynamics in online citizen science. Proceedings of the Eighth AAAI Conference on Weblogs and Social Media, {ICWSM} 2014, Ann Arbor, Michigan, USA, June 1-4, 2014.", "Bikhchandani, Sushil, David Hirshleifer, and Ivo Welch. \"A theory of fads, fashion, custom, and cultural change as informational cascades.\" Journal of political Economy (1992): 992-1026.", "Cheng, Justin, et al. \"Can cascades be predicted?.\" Proceedings of the 23rd international conference on World wide web. International World Wide Web Conferences Steering Committee, 2014.", "Markus Luczak-Roesch, Ramine Tinati, and Nigel Shadbolt. 2015. When Resources Collide: Towards ...

"Wir modellieren eine zweistufige dynamische Investitionsentscheidung mit
Informationsexternalitäten und 'Cheap Talk'. Dabei können wir zunächst zeigen,
dass die Glaubwürdigkeit von 'Cheap Talk'-Aussagen darunter leidet, wenn die
Investitionsentscheidung von solchen Informationen beeinflusst wird, die sich
eher aus dem Handeln der Mitakteure als durch ihre verbalen Bekundungen
ableiten. Dann zeigen wir, dass Informationskaskaden, die alle Akteure dieselbe
Handlung aufgrund öffentlicher Information ohne Berücksichtigung ihrer
privaten Informationen ausführen lassen, dazu führen, das Offenbaren der
wahren Präferenzen der Investoren – optimistisch oder pessimistisch -
anreizkompatibel zu machen. Vergleicht man Projekte mit niedrigen und hohen
Überschüssen, existiert ein Trenngleichgewicht nur bei letzteren, so dass
glaubwürdige Kommunikation eher über Worte als über Taten funktioniert. Will
ein sozialer Planer die Investitionsentscheidungen beeinflussen, kann er sowohl
durch eine Subventionierung als auch durch eine Besteuerung der Investitionen
die Wohlfahrt vergrößern." (Autorenreferat)

On November 17, 2015, the newly elected Canadian government led by Justin Trudeau made an announcement that became a turning point in the heated debate around the plan to build the Memorial to the Victims of Communism in Ottawa. The government's decision to scale the project down was massively republished and generated a heavy stream of 2,055 publications and interactions. The virality of such phenomena is sometimes described in the literature as an "information cascade" characterized by a complex and expanding series of media content that is republished, shared, and commented upon in digital public spheres, reaching a growing number of people. Our research aim is twofold. From a theoretical point of view, we combine Entman's cascade model with the perspective of platform studies. From an empirical point of view, we put this model to the test through a case study of the cascading data flows that emerged during this public debate. We found three key factors that constituted and shaped this information cascade: 1) the economic structure of the Canadian media market, and especially the concentration of media ownership, which is notably high in the Canadian media ecosystem; 2) data-exchange mechanisms and algorithmic filtering that drive the process of news aggregation, quickly spreading media content without being a significant source of user engagement; 3) grassroots engagement in diasporic media, which activates micro public spheres around nested interests and political standpoints regarding the public issue.