168 citations · 841 across the 39 of their papers we have counts for
5 papers · 1 filter
Statistics of co-occurring keywords on Twitter
Joachim Mathiesen, Luiza Angheluta, Mogens H. Jensen
Online social media such as the micro-blogging site Twitter has become a rich source of real-time data on online human behaviors. Here we analyze the occurrence and co-occurrence f…
Excitable human dynamics driven by extrinsic events in massive communities
Joachim Mathiesen, Luiza Angheluta, Peter T. H. Ahlgren +1
Using empirical data from a social media site (Twitter) and on trading volumes of financial securities, we analyze the correlated human activity in massive social organizations. Th…
Modular networks of word correlations on Twitter
Joachim Mathiesen, Pernilly Yde, Mogens H. Jensen
Complex networks are important tools for analyzing the information flow in many aspects of nature and human society. Using data from the microblogging service Twitter, we study net…
Analytical Approach to Continuous and Intermittent Bottleneck Flows
Dirk Helbing, Anders Johansson, Joachim Mathiesen +2
We propose a many-particle-inspired theory for granular outflows from a hopper and for the escape dynamics through a bottleneck based on a continuity equation in polar coordinates.…
Synchronization Model for Stock Market Asymmetry
Raul Donangelo, Mogens H. Jensen, Ingve Simonsen +1
The waiting time needed for a stock market index to undergo a given percentage change in its value is found to have an up-down asymmetry, which, surprisingly, is not observed for t…