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Counting dense connected hypergraphs via the probabilistic method Early View

  • Journal: Random Structures & Algorithms
  • Authors: Béla Bollobás, Oliver Riordan
  • Published Date: Feb 13, 2018

Abstract In 1990 Bender, Canfield, and McKay gave an asymptotic formula for the number of connected graphs on [ n ...

Hodges–Lehmann Detection of Structural Shocks – An Analysis of Macroeconomic Dynamics in the Euro Area Early View

  • Journal: Oxford Bulletin of Economics and Statistics
  • Authors: Helmut Herwartz
  • Published Date: Feb 12, 2018

Abstract Structural shocks in multivariate dynamic systems are hidden and often identified with reference to a priori economic reasoning. Based on a non‐Gaussian framework...

Credit portfolio selection with decaying contagion intensities Early View

  • Journal: Mathematical Finance
  • Authors: Lijun Bo, Agostino Capponi, Peng‐Chu Chen
  • Published Date: Feb 12, 2018

Abstract We develop a fixed‐income portfolio framework capturing the exponential decay of contagious intensities between successive default events. We show that the value...

Corporate security prices in structural credit risk models with incomplete information Early View

  • Journal: Mathematical Finance
  • Authors: Rüdiger Frey, Lars Rösler, Dan Lu
  • Published Date: Feb 12, 2018

Abstract The paper studies derivative asset analysis in structural credit risk models where the asset value of the firm is not fully observable. It is shown that in order...

Extending time‐to‐target plots to multiple instances Early View

  • Journal: International Transactions in Operational Research
  • Authors: Alberto Reyes, Celso C. Ribeiro
  • Published Date: Feb 12, 2018

Abstract Time‐to‐target plots (ttt‐plots) are a useful tool to characterize, evaluate, and compare the behavior of randomized heuristics for a given problem instance of...

A meta‐analysis approach with filtering for identifying gene‐level gene–environment interactions Early View

  • Journal: Genetic Epidemiology
  • Authors: Jiebiao Wang, Qianying Liu, Brandon L. Pierce, Dezheng Huo, Olufunmilayo I. Olopade, Habibul Ahsan, Lin S. Chen
  • Published Date: Feb 11, 2018

Abstract There is a growing recognition that gene–environment interaction (G × E) plays a pivotal role in the development and progression of complex diseases....

Robust Markowitz mean‐variance portfolio selection under ambiguous covariance matrix Early View

  • Journal: Mathematical Finance
  • Authors: Amine Ismail, Huyên Pham
  • Published Date: Feb 11, 2018

Abstract This paper studies a robust continuous‐time Markowitz portfolio selection problem where the model uncertainty affects the covariance matrix of multiple risky...

Unavoidable trees in tournaments Early View

  • Journal: Random Structures & Algorithms
  • Authors: Richard Mycroft, Tássio Naia
  • Published Date: Feb 09, 2018

An oriented tree T on n vertices is unavoidable if every tournament on n vertices contains a copy of T. In this paper, we give a sufficient condition for T to be unavoidable, and use this to prove...

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