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Un frailty aditivo en modelos de supervivencia bivariante
Un frailty aditivo en modelos de supervivencia bivariante
(2009-02-18)
Bivariate survival models based on the presence of an unobseved random covariate, grailty, tend to assume a proportional hazard hypothesis. A bivariate survival model is constructed. It is based on frailty model that acts ...
Un enfoque diferente de las técnicas de clustering para el estudio de epidemias
Un enfoque diferente de las técnicas de clustering para el estudio de epidemias
(2009-02-18)
Classification of an outbreak with the category of epidemics requires that some epidemiological and statistical parameters, which have to be studied simultaneously, are satisfied; mathematical theory helps epidemiologists ...
Ultraproductos de f-anillos proyectables
Ultraproductos de f-anillos proyectables
(2009-02-18)
In [7], Keimel representes the projectable f-rings as continuous sections of Hausdorff sheaves of totally ordered rings. Here, we give a result about the representation of ultraporducts of projectable f-rings in terms of ...
Goal problems in gambling theory
Goal problems in gambling theory
(2009-02-18)
A short introduction to goal problems in abstract gambling theory is given, along with statementes of some of the main theorems and a number of examples, open problems and references. Emphasis is on the finite-state, ...
El espacio cociente y algunas propiedades geométricas de los espacios de Banach
El espacio cociente y algunas propiedades geométricas de los espacios de Banach
(2009-02-18)
We state some geometric properties of Banach spaces, such as uniformly convex spaces, uniformly non-square spaces, local uniformly convex spaces, strictly convex spaces, etc., and we analyze the problem of translating such ...
Relations of k-th derivative of dirac delta in hypercone with ultrahyperbolic operator
Relations of k-th derivative of dirac delta in hypercone with ultrahyperbolic operator
(2009-02-18)
In this paper we prove that the generalized functions d (k) (P+) - d (k) (P), d (k) (P-)-d (k) (-P) and d 1 (k) (P)-d 2 (k) (P)d are concentrated in the vertex of the cone P=0 and we find their relationship with the ...
Optimiza - un paquete computacional para la optimización de problemas no lineales
Optimiza - un paquete computacional para la optimización de problemas no lineales
(2009-02-18)
Our goal is to build a software able to solve problems in non linear optimization. A central point is selection of the algorithm, which is based on Augmented Lagrangian Method combined with quasi-Newton methods (BFGS, ...