Results 211 to 220 of about 13,755 (295)

Multidimensional frailty and sleep quality in late adulthood: A UK biobank examination

open access: yesJournal of Sleep Research, Volume 34, Issue 2, April 2025.
Summary Frailty and sleep disturbances are two major concerns in late adulthood, that not only profoundly threaten health and wellbeing at the individual level but place enormous demands on our healthcare systems. Given that both constructs represent dynamic states that are preventable and reversible, understanding the potential pathways to and effects
Sarah P. Coundouris   +2 more
wiley   +1 more source

Markov Determinantal Point Process for Dynamic Random Sets

open access: yesJournal of Time Series Analysis, EarlyView.
ABSTRACT The Law of Determinantal Point Process (LDPP) is a flexible parametric family of distributions over random sets defined on a finite state space, or equivalently over multivariate binary variables. The aim of this paper is to introduce Markov processes of random sets within the LDPP framework. We show that, when the pairwise distribution of two
Christian Gouriéroux, Yang Lu
wiley   +1 more source

Partial Observability of Implied Volatility Matrices: Identification and Covolatilities Filtering

open access: yesMathematical Finance, EarlyView.
ABSTRACT Whereas data on implied volatilities are available for a large number of assets, this is less frequently the case of implied covolatilities. We introduce a new approach based on static and dynamic Wishart models to solve this problem of missing data.
Christian Gouriéroux, Yang Lu
wiley   +1 more source

Maximal Differentiation or Minimal Differentiation? Signal Jamming in Location Competition in Duopoly

open access: yesThe Manchester School, EarlyView.
ABSTRACT In this study, we argue that the result of maximal differentiation by d’Aspremont et al. (1979) is not robust against all variations in qualities. The result that two firms are located at opposite ends of a linear city holds only when the product qualities are identical or similar.
Sawoong Kang, Jeong‐Yoo Kim
wiley   +1 more source

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