96 citations · 286 across the 18 of their papers we have counts for
5 papers · 1 filter
Opinion Dynamics with Hopfield Neural Networks
Dietrich Stauffer, Przemyslaw A. Grabowicz, Janusz A. Holyst
In Hopfield neural networks with up to 10^8 nodes we store two patterns through Hebb couplings. Then we start with a third random pattern which is supposed to evolve into one of th…
A threshold model of financial markets
Paweł Sieczka, Janusz A. Hołyst
We proposed a model of interacting market agents based on the Ising spin model. The agents can take three actions: "buy," "sell," or "stay inactive." We defined a price evolution i…
Statistical properties of short term price trends in high frequency stock market data
Paweł Sieczka, Janusz A. Hołyst
We investigated distributions of short term price trends for high frequency stock market data. A number of trends as a function of their lengths was measured. We found that such a…
Growing Trees in Internet News Groups and Forums
Bernard Kujawski, Janusz A. Holyst, Geoff J. Rodgers
We present an empirical study of the networks created by users within internet news groups and forums and show that they organise themselves into scale-free trees. The structure of…
Phase transitions in social networks
Piotr Fronczak, Agata Fronczak, Janusz A. Hołyst
We study a model of network with clustering and desired node degree. The original purpose of the model was to describe optimal structures of scientific collaboration in the Europea…