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- Karsten Keller, Anton M. Unakafov, Valentina A. Unakafova
- Entropy
- 2014

In this paper we illustrate the potential of ordinal-patterns-based methods for analysis of real-world data and, especially, of electroencephalogram (EEG) data. We apply already known (empiricalâ€¦ (More)

- Karsten Keller, Mathieu Sinn, JAN EMONDS, J. Emonds
- 1991

Ordinal time series analysis is a new approach to the investigation of long and complex time series, which bases on ordinal patterns describing the order relations between the values of a timeâ€¦ (More)

- Valentina A. Unakafova, Karsten Keller
- Entropy
- 2013

Permutation entropy, introduced by Bandt and Pompe, is a conceptually simple and well-interpretable measure of time series complexity. In this paper, we propose efficient methods for computing it andâ€¦ (More)

- Mathieu Sinn, Ali Ghodsi, Karsten Keller
- UAI
- 2012

As a new method for detecting change-points in high-resolution time series, we apply Maximum Mean Discrepancy to the distributions of ordinal patterns in different parts of a time series. The mainâ€¦ (More)

- Karsten Keller, JÃ¼rgen H. Prochaska, +11 authors Philipp Wild
- Thrombosis research
- 2015

BACKGROUND
Pulmonary embolism (PE) is the consequence of deep vein thrombosis (DVT) in 70% of all cases. Although, PE and DVT are commonly related to risk factors of Virchow's triad, both entitiesâ€¦ (More)

- Karsten Keller, Heinz Lauffer
- I. J. Bifurcation and Chaos
- 2003

In order to extract and to visualize qualitative information from a highdimensional time series, we apply ideas from symbolic dynamics. Counting certain ordinal patterns in the given series, weâ€¦ (More)

- Karsten Keller, Johannes Beule, Andreas Schulz, Meike Coldewey, Wolfgang G. Dippold, JÃ¶rn Oliver Balzer
- Thrombosis research
- 2014

BACKGROUND
Echocardiography for risk stratification in hemodynamically stable patients with pulmonary embolism (PE) is well-established. Right ventricular dysfunction (RVD) is associated with anâ€¦ (More)

- Karsten Keller, Johannes Beule, Meike Coldewey, Martin Geyer, JÃ¶rn Oliver Balzer, Wolfgang G. Dippold
- Experimental gerontology
- 2015

INTRODUCTION
Right ventricular dysfunction (RVD), submassive pulmonary embolism (PE), elevated systolic pulmonary artery pressure (sPAP), elevated cardiac troponin I (cTnI) and old age are well-knownâ€¦ (More)

Ordinal time series analysis is a new approach to the qualitative investigation of long and complex time series. The idea behind it is to transform a given time series into a series of ordinalâ€¦ (More)

In the case of ergodicity much of the structure of a one-dimensional time-discrete dynamical system is already determined by its ordinal structure. We generally discuss this phenomenon by consideringâ€¦ (More)