Fraunhofer-Gesellschaft

Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Studying Dynamics of User Behavior. Heterocedastic Time Series Forecasting and Clustering of Inhomogeneous Poisson Process

 
: Cvejoski, Kostadin
: Bauckhage, Christian; Wrobel, Stefan

:
Volltext urn:nbn:de:0011-n-5523583 (4.5 MByte PDF)
MD5 Fingerprint: 118962c0010ee636ffc44cb7d66df8e5
Erstellt am: 26.7.2019


Bonn, 2016, 66 S.
Bonn, Univ., Master Thesis, 2016
Englisch
Master Thesis, Elektronische Publikation
Fraunhofer IAIS ()

Abstract
Complex time series patterns are generated by the behavior of a large number of different users in so the called question and answering web platforms. This calls for flexible, accurate and descriptive techniques for studying the dynamics of such systems. In this study, we extend the Sparse Input Gaussian Process formalism, in order to incorporate functional description of the input dependent noise. Such procedure also provides a regularization method that improves the accuracy of the predictions. We compare our results with the results of the other Gaussian Process methods, and apply the methodology to time series from the questions and answer web site Stackoverflow. For finding the common behavior between the users we propose the scale invariant Dynamic Piecewise Similarity measures an d the K-PSC clustering algorithm for clustering time series in order to provide much more descriptive cluster centroids then the centroids from the K-Means clustering algorithm.

: http://publica.fraunhofer.de/dokumente/N-552358.html