New results on mixture and exponential models by Orlicz spaces

New results and improvements in the study of nonparametric exponential and mixture models are proposed. In particular, different equivalent characterizations of maximal exponential models, in terms of open exponential arcs and Orlicz spaces, are given. Our theoretical results are supported by several examples and counterexamples and provide an answer to some open questions in the literature.Comment: Published at http://dx.doi.org/10.3150/15-BEJ698 in the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm

Exponential models by Orlicz spaces and applications

We use maximal exponential models to characterize a suitable polar cone in a mathematical convex optimization framework. A financial application of this result is provided, leading to a duality minimax theorem related to portfolio exponential utility maximization

Forward Backward SDEs Systems for Utility Maximization in Jump Diffusion Models

We consider the classical problem of maximizing the expected utility of terminal net wealth with a final random liability in a simple jump-diffusion model. In the spirit of Horst et al. (2014) and Santacroce-Trivellato (2014), under suitable conditions the optimal strategy is expressed in implicit form in terms of a forward backward system of equations. Some explicit results are presented for the pure jump model and for exponential utilities

The Relations between Resilience and Self-efficacy among Healthcare Practitioners, in Context of COVID-19 Pandemic - A Rapid Review

Purpose The purpose of this rapid review was to present current evidence on relations between resilience and self-efficacy among healthcare practitioners in the context of COVID-19 pandemic. Design/methodology/approach Literature searches were conducted in February/2022 in the online database MEDLINE EBSCO and not date/time limited. Eligibility criteria were as follows: population – healthcare practitioners, interest – relations between resilience and self-efficacy and context – COVID-19. Findings Six eligible studies from Italy, China, United Kingdom, India, Pakistan and Spain, published between 2020 and 2021 were included in the review. All studies used quantitative methods. The relations between resilience and self-efficacy were identified in contexts of resilience programs, measuring mental health of frontline nurses, measuring nurses' and nursing students' perception of psychological preparedness for pandemic management, perception of COVID-19 severity and mediating roles of self-efficacy and resilience between stress and both physical and mental quality of life. Findings indicated limited research on this topic and a need for more research. Practical implications Broader understanding of the relations between resilience and self-efficacy may help healthcare organizations' leaders/managers aiming to support resilience of their employers under challenging circumstances such as future pandemic. Originality/value The latest COVID-19 pandemic presented the opportunity to research relations between resilience and self-efficacy and enrich existed research in a new and extraordinary context.publishedVersio

More than a diagnosis

Three women speak of and analyse their abandonment by healthcare professionals in the past five years following their foetus' diagnosis of a genetic disorder during pregnancy. As educated women, we were bewildered by our medical care, or lack thereof. Following prenatal diagnostics of trisomy 13 or 18, we chose to continue our pregnancies. We understood that our babies would most likely die in utero or soon after birth. To enable ourselves to make informed choices, we sought information from the internet. Here, it was discovered that some babies with these trisomies can live contented, comfortable lives for many years. We considered this information as well as the anomalies of our unborn and planned accordingly. We did not want our babies to receive nonbeneficial, burdensome interventions, nor did we want them to suffer. Our hopes were not for a miracle but were much simpler: to meet and hold our babies and to be a family. Although our children, choices and outcomes are unique, we all hoped for time with our babies. We also all wished to be able to make informed decisions that respected the dignity of the fragile lives we carried. IN UTERO Pauline, mother of Liam (trisomy 18) 'Your baby isn't going to live', my obstetrician commented as I sat behind the steering wheel. Although I felt comfortable with him, he supplied me with no information about trisomy 18. At my second ultrasound I found myself panicking over my lack of specialist support. Liam had numerous medical complications and no one had spoken to me about his care. Sadly, it was my obstetrician's lack of referral that left me feeling professionally abandoned