14 citations · 23 across the 3 of their papers we have counts for
3 papers
q-fin.ST2008★ 6 cited
Probability of Large Movements in Financial Markets
Robert Kitt, Maksim Sakki, Jaan Kalda
Based on empirical financial time-series, we show that the "silence-breaking" probability follows a super-universal power law: the probability of observing a large movement is inve…
physics.med-ph2003★ 3 cited
Non-linear and scale-invariant analysis of the Heart Rate Variability
J. Kalda, M. Sakki, M. Vainu +1
Human heart rate fluctuates in a complex and non-stationary manner. Elaborating efficient and adequate tools for the analysis of such signals has been a great challenge for the res…
physics.med-ph2001★ 14 cited
Zipf's law in human heartbeat dynamics
J. Kalda, M. Sakki, M. Vainu +1
It is shown that the distribution of low variability periods in the activity of human heart rate typically follows a multi-scaling Zipf's law. The presence or failure of a power la…