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Claudia Redenbach Aila Särkkä Johannes Freitag Katja Schladitz 《AStA Advances in Statistical Analysis》2009,93(3):237-261
This paper introduces methods for the detection of anisotropies which are caused by compression of regular 3D point patterns.
Isotropy tests based on directional summary statistics and estimators for the compression factor are developed. Using simulated
data, the dependence of the power of these methods on the intensity, the degree of regularity, and the compression strength
is studied. Finally, our methods are applied to the point patterns of centers of air pores extracted from tomographic images
of ice cores. This way the presence of anisotropies in the ice caused by the compression of the ice sheet and an increase
of their strength with increasing depth are shown. 相似文献
74.
75.
Francesco C. Billari Johannes Fürnkranz Alexia Prskawetz 《Revue europeenne de demographie》2006,22(1):37-65
In this paper we discuss and apply machine learning techniques, using ideas from a core research area in the artificial intelligence
literature to analyse simultaneously timing, sequencing, and quantum of life course events from a comparative perspective.
We outline the need for techniques which allow the adoption of a holistic approach to life course analysis, illustrating the
specific case of the transition to adulthood. We briefly introduce machine learning algorithms to build decision trees and
rule sets and then apply such algorithms to delineate the key features which distinguish Austrian and Italian pathways to
adulthood, using Fertility and Family Survey data. The key role of sequencing and synchronization between events emerges clearly
from the analysis.
Billari F.C., Fürnkranz J., et Prskawetz A., 2006. Calendrier, séquence et intensitédes événements du cycle de vie : une application
des techniques d’apprentissage par machine. Revue Européenne de Démographie, 22: 37–65 相似文献
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77.
Johannes Hrner Satoru Takahashi Nicolas Vieille 《Econometrica : journal of the Econometric Society》2015,83(5):1795-1848
This paper characterizes an equilibrium payoff subset for dynamic Bayesian games as discounting vanishes. Monitoring is imperfect, transitions may depend on actions, types may be correlated, and values may be interdependent. The focus is on equilibria in which players report truthfully. The characterization generalizes that for repeated games, reducing the analysis to static Bayesian games with transfers. With independent private values, the restriction to truthful equilibria is without loss, except for the punishment level: if players withhold their information during punishment‐like phases, a folk theorem obtains. 相似文献
78.
Prof. Dr. Johannes Weiß 《KZfSS K?lner Zeitschrift für Soziologie und Sozialpsychologie》2001,53(3):616-617
Ohne Zusammenfassung 相似文献
79.
Johannes Schaub 《Gruppendynamik und Organisationsberatung》2002,33(3):295-310
Social networks were a very important component of the society of the GDR. This suggests a study of these networks — especially friendship networks — in Germany’s new federal states. Ego-centered friendship networks in the present, as well as for the final days of the GDR, are analysed with network-analytic methods. The 83 participants of the examination were selected via snowball sampling. The results are not homogenous. Some impressively document how people reacted to the circumstances in the GDR, while others do not show any difference to studies from the old German federal states. Some further results show that changes have taken place. 相似文献
80.
Morten Birkeland Nielsen Anders Skogstad Johannes Gjerstad Ståle Valvatne Einarsen 《Work and stress》2019,33(2):137-155
ABSTRACTThe aim of this study was to determine the direction of associations between perceived leadership styles of an immediate leader and state anxiety among subordinates using time-lagged data from a large and heterogeneous probability sample of Norwegian employees. It was hypothesised that high levels of transformational leadership would be associated with a decrease, whereas high levels of laissez-faire leadership would be associated with an increase, in subsequent levels of anxiety. Reciprocal associations were also expected in that higher levels of anxiety were hypothesised to be related to subsequent increase in reports of laissez-faire, and decrease in reported exposure to transformational leadership. The sample comprised 1149 Norwegian employees. The design was a two-wave full panel study with a six-month time interval between the baseline and follow-up assessments. Contrary to hypotheses, neither transformational nor laissez-faire leadership were significantly related to subsequent levels of state anxiety. In support of hypotheses, baseline low levels of state anxiety were associated with reporting the immediate leader as less transformational and more laissez-faire six months later. In conclusion, the findings challenge theoretical models that explain leadership as a one-way superior–subordinate influence process. 相似文献