3,394 research outputs found
A semiparametric bivariate probit model for joint modeling of outcomes in STEMI patients
No full textIn this work we analyse the relationship among in-hospital mortality and a treatment effectiveness outcome in patients affected by ST-Elevation myocardial infarction. The main idea is to carry out a joint modeling of the two outcomes applying a Semiparametric Bivariate Probit Model to data arising from a clinical registry called STEMI Archive. A realistic quantification of the relationship between outcomes can be problematic for several reasons. First, latent factors associated with hospitals organization can affect the treatment efficacy and/or interact with patient’s condition at admission time. Moreover, they can also directly influence the mortality outcome. Such factors can be hardly measurable. Thus, the use of classical estimation methods will clearly result in inconsistent or biased parameter estimates. Secondly, covariate-outcomes relationships can exhibit nonlinear patterns. Provided that proper statistical methods for model fitting in such framework are available, it is possible to employ a simultaneous estimation approach to account for unobservable confounders. Such a framework can also provide flexible covariate structures and model the whole conditional distribution of the response
Editorial IPRD06
No full textEditorial dei Proceedings del 10th Topical Seminar on Innovative Particle and Radiation Detectors (IPRD06) 1 - 5 October 2006 Siena, Ital
L. Ballesteros Pastor, Pompeyo Trogo, Justino y Mitrídates. Comentario al Epítome de las Historias Filípicas (37,1,6 – 38,8,1), Zürich – New York 2013
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Strange distributionally chaotic triangular maps III
No full textIn the class of triangular maps of the square we consider the strongest notion of distributional chaos, DC1, originally introduced by Schweizer and Smítal [Trans Amer Math Soc 1994;344:737–854] for continuous maps of the interval. We show that a map is DC1 if F has a periodic orbit with period ≠ 2n, for any n 0. Consequently, a map in is DC1 if it has a homoclinic trajectory. This result is important since in general systems like , positive topological entropy itself does not imply DC1. It contributes to the solution of a long-standing open problem of A. N. Sharkovsky concerning classification of triangular maps of the square
Bitinia e Paflagonia tra Alessandro e i Diadochi (334-301)
No full textAn overview of the history of Northern Asia Minor in the early Hellenistic ag
Framing Big Data : A Linguistic and Discursive Approach
No full textThis volume addresses big data as a socio-technical construct with huge potential for innovation in key sectors such as healthcare, government and business. Big data and its increasingly widespread use in such influential spheres can generate ethically controversial decisions, including questions surrounding privacy, consent and accountability. The research attempts to unpack the epistemological implications of the term ‘big data’, as well as the opportunities and responsibilities which come with it. The author analyses the linguistic texture of the big data narrative in the news media, in healthcare and in EU law on data protection, in order to contribute to its understanding from the critical perspective of language studies
Strange distributionally chaotic triangular maps II
No full textThe notion of distributional chaos was introduced by Schweizer and Smítal [Measures of chaos and a spectral decompostion of dynamical systems on the interval. Trans. Amer. Math. Soc. 1994; 344:737–854] for continuous maps of the interval. For continuous maps of a compact metric space three mutually nonequivalent versions of distributional chaos, DC1–DC3, can be considered. In this paper we study distributional chaos in the class Tm of triangular maps of the square which are monotone on the fibres. The main results: (i) If F in Tm has positive topological entropy then F is DC1, and hence, DC2 and DC3. This result is interesting since similar statement is not true for general triangular maps of the square [Smítal and Štefánková, Distributional chaos for triangular maps, Chaos, Solitons & Fractals 2004; 21:1125–8]. (ii) There are F1,F2 in Tm which are not DC3, and such that not every recurrent point of F1 is uniformly recurrent, while F2 is Li and Yorke chaotic on the set of uniformly recurrent points. This, along with recent results by Forti et al. [Dynamics of homeomorphisms on minimal sets generated by triangular mappings. Bull Austral Math Soc 59;1999:1–20], among others, make possible to compile complete list of the implications between dynamical properties of maps in Tm, solving a long-standing open problem by Sharkovsky
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