Modeling the structure and evolution of discussion cascades.
V. Gomez, Bert Kappen and A. Kaltenbrunner
In: ACM Conference on Hypertext and Hypermedia, 22nd, 2011, 2011.
We analyze the structure and evolution of discussion cascades
in four popular websites: Slashdot, Barrapunto, Me-
neame and Wikipedia. Despite the big heterogeneities between
these sites, a preferential attachment (PA) model with
bias to the root can capture the temporal evolution of the observed
trees and many of their statistical properties, namely,
probability distributions of the branching factors (degrees),
subtree sizes and certain correlations. The parameters of
the model are learned efficiently using a novel maximum
likelihood estimation scheme for PA and provide a figurative
interpretation about the communication habits and the
resulting discussion cascades on the four different websites.