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A note on a smooth projective surface with Picard number 2 Early View

  • Journal: Mathematische Nachrichten
  • Authors: Sichen Li
  • Published Date: Aug 12, 2019

Abstract We characterize the integral Zariski decomposition of a smooth projective surface with Picard number 2 to partially solve a problem of B. Harbourne, P. Pokora, and H. Tutaj‐Gasinska...

An optimal Bayesian predictive probability design for phase II clinical trials with simple and complicated endpoints Early View

  • Journal: Biometrical Journal
  • Authors: Beibei Guo, Suyu Liu
  • Published Date: Aug 12, 2019

Abstract Most existing phase II clinical trial designs focus on conventional chemotherapy with binary tumor response as the endpoint. The advent of novel therapies, such as molecularly targeted agents...

On a pairing for algebraic tori Early View

  • Journal: Mathematische Nachrichten
  • Authors: A. Merkurjev
  • Published Date: Aug 12, 2019

Abstract Let T be an algebraic torus over a field F. There is a pairing between the groups of torsors for the torus T and its dual with values in the third Galois cohomology group over all field...

Income Tax Progressivity: Trends and Implications Early View

  • Journal: Oxford Bulletin of Economics and Statistics
  • Authors: Claudia Gerber, Alexander Klemm, Li Liu, Victor Mylonas
  • Published Date: Aug 10, 2019

Abstract This paper discusses how the structure of the tax system affects its progressivity. It suggests a measure of progressive capacity of tax systems, based on the Kakwani index, but independent...

Dual Credit Markets and Household Usage to Finance: Evidence from a Representative Chinese Household Survey Early View

  • Journal: Oxford Bulletin of Economics and Statistics
  • Authors: Robert Cull, Li Gan, Nan Gao, Lixin Colin Xu
  • Published Date: Aug 09, 2019

Abstract Using a new and representative data set of Chinese household finance, we document household usage and costs of finance, along with their correlates. As in many developing countries, informal...

Quantile forecasting based on a bivariate hysteretic autoregressive model with GARCH errors and time ‐varying correlations Early View

  • Journal: Applied Stochastic Models in Business and Industry
  • Authors: Cathy W.S. Chen, Hong Than‐Thi, Mike K.P. So, Songsak Sriboonchitta
  • Published Date: Aug 09, 2019

Abstract To understand and predict chronological dependence in the second‐order moments of asset returns, this paper considers a multivariate hysteretic autoregressive (HAR) model with generalized...

Estimating the Mean Direction of Strongly Dependent Circular Time Series Early View

  • Journal: Journal of Time Series Analysis
  • Authors: Sucharita Ghosh, Jan Beran
  • Published Date: Aug 08, 2019

A class of circular processes based on Gaussian subordination is introduced. This allows for flexible modelling of directional time series with long‐range dependence. Based on limit theorems for...

Estimating the decision curve and its precision from three study designs Early View

  • Journal: Biometrical Journal
  • Authors: Mitchell H. Gail, Ruth M. Pfeiffer
  • Published Date: Aug 08, 2019

Abstract The decision curve plots the net benefit of a risk model for making decisions over a range of risk thresholds, corresponding to different ratios of misclassification costs. We discuss three...

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