Linear prediction of weak records: the discrete case

We characterize the family of discrete distributions for which the best mean square error predictor of a future weak record is a linear function of a past or observed weak record

Order statistics from overlapping samples: bivariate densities and regression properties

In this paper we are interested in the joint distribution of two order statistics from overlapping samples. We give an explicit formula for the distribution of such a pair of random variables under the assumption that the parent distribution is absolutely continuous (with respect to the Lebesgue measure on the real line). The distribution is identified through the form of the density with respect to a measure which is a sum of the bivariate Lebesgue measure on R2 and the univariate Lebesgue measure on the diagonal {(x, x) : x ∈ R}. We are also interested in the question to what extent conditional expectation of one of such order statistic given another determines the parent distribution. In particular, we provide a new characterization by linearity of regression of an order statistic from the extended sample given the one from the original sample, special case of which solves a problem explicitly stated in the literature. It appears that to describe the correct parent distribution it is convenient to use quantile density functions. In several other cases of regressions of order statistics we provide new results regarding uniqueness of the distribution in the sample. Nevertheless the general question of identifiability of the parent distribution by regression of order statistics from overlapping samples remains open.Ministry of Science and Technology, TaiwanMinisterio de Economia, Industria y Competitividad (MINECO). EspañaNational Science Center, Polan

A characterization of distributions based on linear regression of order statistics and record values

We obtain the family of distributions for which the regression of one order statistic on another, not necessarily adjacent, is linear. As a consequence, we present a characterization of uniform distributions on an interval. We also characterize the distributions that appear when we impose the condition of linearity of regression for record values

Aplicación del muestreo sistemático en el diseño de encuestas

La obtención de muestras utilizando el muestreo sistemático es algo que se ha llevado a cabo desde principios del siglo XX, debido a la simplicidad de su manejo. Como inconveniente, los diseños sistemáticos clásicos no son estimables, por lo que no podemos suministrar estimadores directos del error de muestreo cometido. Este inconveniente ha tratado de salvarse a través de distintas variantes sobre la versión más simple del muestreo sistemático. En este trabajo, proponemos otra variante, en la que se hace aleatorio el paso del muestreo sistemático, siguiendo una determinada variable, lo que nos conduce a un diseño equivalente al muestreo aleatorio simple y, por tanto, estimable. Conseguimos así un procedimiento secuencial de obtención de muestras de gran utilidad en poblaciones que tienen una cierta estructura, y fácilmente implementable en la realización de encuestas

Thermal applications of biomass in hospitals

The aim of this study was to evaluate the feasibility of using renewable energy from biomass for the production of heat and cold in hospitals, examining the feasibility of establishing such facilities in Extremadura (Spain). In its development, has been taken into account the technical aspects related to the operation of this type of heating, including reliability and maintainability of them, assessing the problems generated by the introduction of renewable energy from biomass in publics buildings. It has been shown that high consumption of hot water and heating systems consume annually make the hospital a great place for the installation of thermal production systems based on biomass, because the necessary demand and its continued operation, promotes amortization. In addition, it was found that promoting the use of renewable energy through biomass, can help create and consolidate a native biomass market, emerging at the beginning of this project and in the consolidation phase at the present time, that eventually will get an economic improvement in rural areas, promoting its development

Evaluation of a Spoken Dialogue System for controlling a Hifi audio system

In this paper a Bayesian Networks, BNs, approach to dialogue modelling [1] is evaluated in terms of a battery of both subjective and objective metrics. A significant effort in improving the contextual information handling capabilities of the system has been done. Consequently, besides typical dialogue measurement rates for usability like task or dialogue completion rates, dialogue time, etc. we have included a new figure measuring the contextuality of the dialogue as the number of turns where contextual information is helpful for dialogue resolution. The evaluation is developed through a set of predefined scenarios according to different initiative styles and focusing on the impact of the user’s level of experience

Effect of Different Insulin Therapies on Obstetric-Fetal Outcomes

To evaluate the effectiveness of the different insulin therapies on obstetrics-fetal outcomes in women with pregestational diabetes mellitus. We enrolled 147 pregnant women with pre-existing type 1 or 2 diabetes mellitus. Clinical and biochemical parameters were analysed in relation to obstetric and fetal outcomes. 14.2% received treatment with Neutral Protamine Hagedorn insulin and short-acting insulin analogues; 19% with premixed human insulin; 40.1% with insulin glargine and lispro, 6.2% with detemir and aspart and 20% with continuous subcutaneous insulin infusion. All 5 types of treatment achieved a reduction of the mean HbA1c during pregnancy (p = 0.01). Pre-pregnancy care was carried out for 48% of patients. We found no statistically significant differences between the different insulin therapies and the obstetric-fetal outcomes. In conclusión, the different insulin therapies used in patients with pregestational diabetes mellitus does not seem to affect obstetric-fetal outcomes