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51.
M. Ruiz Espejo 《Statistics》2013,47(2):287-291
A new expression of the variance of the units from a stratified finite population wit L strata, is obtained in funcions of the means L–1 strata, and in conseqeuence we obtained formulae which relates the mean of a stratum in a statistical study with the population mean and the ones of the remaining strate. As an application, we obtained a useful checking of the estimation consistency by stratified sampling in any precies survey 相似文献
52.
Brigitte Bagnol Matthew Chersich Esmeralda Mariano Adriane Martin Hilber 《心理学和人类性特征杂志》2015,27(3):324-336
Objective: In this article, we review insertion, application, and cleansing as they include the use of products other than water and have a number of harmful effects. Method: In 2007, a household survey of 919 women carried out in Tete Province, Mozambique, examined 8 vaginal practices. Results: Overall, 10% of the sexually active women reported regularly using these 3 vaginal practices concurrently. Of the women who practiced insertion, 65% used natural substances. A wider variety of products was used for applying substances on the external genitalia and for cleansing purposes. Conclusions: These findings have important implications for future HIV prevention, including in the use of microbicides. 相似文献
53.
54.
The life lengths of the units in a system can be modelled by a bivariate distribution. In this paper, we suppose that the
joint distribution of the units is a symmetric bivariate Pareto (Lomax) distribution. For this model, we obtain basic reliability
properties for series and parallel systems.
J. M. Ruiz Partially Supported by Ministerio de Ciencia y Tecnologia under grant BFM2003-02947 and Fundacion Seneca under
grant 00698/PI/04. 相似文献
55.
56.
Lucia Malaguarnera Erika Cristaldi Helga Lipari Mariano Malaguarnera 《European review of aging and physical activity》2008,5(2):61-68
Several lines of evidence indicate that infectious diseases, cancer, and autoimmune disorders occur more frequently in elderly
people, thus suggesting that altered function of immune organs and cells, such as thymus and T and B lymphocytes are of primary
importance in the pathogenesis of these diseases. Furthermore, old subjects are less responsive to vaccine than younger because
of immune changes. The most common changes accompanying the adaptive immune system include decrement of T and B cells proliferation,
repertoire degeneracy, increase of the memory cell type, decreased numbers of naive cells, and shift from T helper1 (Th1) to T helper2 (Th2) response. Regular exercise in the elderly may improve the alterations in acquired immunity which follow the physiological
process of aging, allowing a major resistance against external pathogens and a better quality of life. 相似文献
57.
In this paper the issue of making inferences with misclassified data from a noisy multinomial process is addressed. A Bayesian model for making inferences about the proportions and the noise parameters is developed. The problem is reformulated in a more tractable form by introducing auxiliary or latent random vectors. This allows for an easy-to-implement Gibbs sampling-based algorithm to generate samples from the distributions of interest. An illustrative example related to elections is also presented. 相似文献
58.
59.
In this paper we give some properties of the expected values of any order statistic when one of its adjacent order statistics
is known (order mean function) from a sequence of sizen of independent and identically distributed random variables with discrete distribution. Furthermore, we obtain the explicit
expressions of the distribution from these order mean functions, and finally, we show the necessary and sufficient conditions
for any real function to be an order mean function. We also add some examples of characterization of discrete distributions
from the order mean functions.
Partially supported by Consejería de Cultura y Educación (C.A.R.M.), under Grant PIB 95/90. 相似文献
60.
Combining data of several tests or markers for the classification of patients according to their health status for assigning better treatments is a major issue in the study of diseases such as cancer. In order to tackle this problem, several approaches have been proposed in the literature. In this paper, a step-by-step algorithm for estimating the parameters of a linear classifier that combines several measures is considered. The optimization criterion is to maximize the area under the receiver operating characteristic curve. The algorithm is applied to different simulated data sets and its performance is evaluated. Finally, the method is illustrated with a prostate cancer staging database. 相似文献