963 resultados para Statistics and probability


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Guided by a modified information-motivation-behavioral skills model, this study identified predictors of condom use among heterosexual people living with HIV with their steady partners. Consecutive patients at 14 European HIV outpatient clinics received an anonymous, standardized, self-administered questionnaire between March and December 2007. Data were analyzed using descriptive statistics and two-step backward elimination regression analyses stratified by gender. The survey included 651 participants (n = 364, 56% women; n = 287, 44%). Mean age was 39 years for women and 43 years for men. Most had acquired HIV sexually and more than half were in a serodiscordant relationship. Sixty-three percent (n = 229) of women and 59% of men (n = 169) reported at least one sexual encounter with a steady partner 6 months prior to the survey. Fifty-one percent (n = 116) of women and 59% of men (n = 99) used condoms consistently with that partner. In both genders, condom use was positively associated with subjective norm conducive to condom use, and self-efficacy to use condoms. Having a partner whose HIV status was positive or unknown reduced condom use. In men, higher education and knowledge about condom use additionally increased condom use, while the use of erectile-enhancing medication decreased it. For women, HIV disclosure to partners additionally reduced the likelihood of condom use. Positive attitudes to condom use and subjective norm increased self-efficacy in both genders, however, a number of gender-related differences appeared to influence self-efficacy. Service providers should pay attention to the identified predictors of condom use and adopt comprehensive and gender-related approaches for preventive interventions with people living with HIV.

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OBJECTIVE To investigate the socioeconomic and clinical factors that contribute to the functional independence of the oldest old of a community. METHOD Cross-sectional quantitative study whose sample consisted of 214 elderly people registered in Basic Health Units. Data were collected through structured interviews and application of the Functional Independence Measure. We used descriptive statistics, and for association of the variables we used the Student t-test, ANOVA and Tukey's test for multiple comparisons. RESULTS The significant variables that contributed to the functional independence were remaining economically active, practicing physical and leisure activities, having a social life, eating fruits, vegetables and meat. The orientation to conduct these practices reduces the demand for care and help needed in everyday activities. CONCLUSION Maintaining independence is primordial to delay disability and presents itself as an excellent field of work for nursing.

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We investigate identifiability issues in DSGE models and their consequences for parameter estimation and model evaluation when the objective function measures the distance between estimated and model impulse responses. We show that observational equivalence, partial and weak identification problems are widespread, that they lead to biased estimates, unreliable t-statistics and may induce investigators to select false models. We examine whether different objective functions affect identification and study how small samples interact with parameters and shock identification. We provide diagnostics and tests to detect identification failures and apply them to a state-of-the-art model.

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Se houve um tempo em que eram as empresas as mais preocupadas em dotar os seus empregados com um determinado leque de competências técnicas, pela via da Formação Profissional, para se tornarem cada vez mais competitivas, hoje torna-se crucial para qualquer país poder determinar o grau de empregabilidade dos diversos cursos de formação profissional realizados pela sua população activa, de modo a optimizar a inserção dos seus cidadãos no mercado de trabalho. A presente investigação visa analisar a empregabilidade a partir de um caso nacional, em que uma escola de formação profissional, inserida numa empresa – a Cabnave – vem desenvolvendo um modelo de formação, que para além de estar directamente relacionado com a sua própria actividade, encontra-se ligado a vários sectores da actividade económica de Cabo Verde, particularmente ao da indústria Mecânica e Metalomecânica. O estudo contém dois principais momentos. Um primeiro, no qual se procedeu à contextualização e fundamentação do tema, com base em bibliografia nacional e internacional, e enfoque nos seguintes assuntos: o sistema de ensino em Cabo Verde, mais concretamente a via do ensino secundário técnico; a formação profissional; e o mercado de trabalho em Cabo Verde. Num segundo momento desenvolveu-se um Caso de Estudo, para se determinar o grau de empregabilidade dos diplomados da Escola de Formação Profissional da Cabnave, que seguiram uma carreira em áreas profissionais diferentes do curso realizado, recorrendo-se à aplicação de um questionário a uma amostra final de 80 inquiridos, e à interpretação dos resultados, através dos métodos de análise estatística Descritiva e Correlacional. Das conclusões resultantes da análise das respostas obtidas, chama-se a atenção para o facto de a maioria dos diplomados partilharem de uma opinião positiva relativamente à empregabilidade dos cursos que frequentaram, independentemente de os mesmos terem ou não conduzido a uma profissão directamente ligada ao sector da Mecânica e MetalomecânicaIf at one point companies used to be the ones that were the most concerned with providing specific technical skills to their employees, through professional education, as to become more competitive, it is today highly important for every country to determine the level of employability of the numerous professional education programs pursued by its active population, so as to increase citizens’ chances to enter the labor market. The present research aims to study the concept of employability, with focus on a national case, a school of professional education which integrates the company Cabnave, and has been developing an educational model that, in addition to responding to the company’s own needs, is also connected to Cape Verde’s various economic sectors, notably the Mechanics and Metalworking industry. The study consists of two main parts. A first one where, based on national and international bibliography, the theme is contextualized, with closest attention to the following subjects: the Cape Verdean education system, especially vocational education in secondary schools; professional education; and the labor market in Cape Verde. In the second part, a Case Study is conducted, in order to determine the level of employability of those who were trained by Cabnave’s School of Professional Education, but have pursued a career in a different professional field. Therefore, a questionnaire was submitted to a sample of 80 respondents, and the correspondent data was analyzed and interpreted, with the use of Descriptive Statistics and Correlation Analysis. One of the conclusions deriving from the survey results is that most of the School’s trained graduates have a positive view of the employability of the programs they have pursued, independently of whether they continued to work in the Mechanics and Metalworking industry

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Este trabalho baseia-se na análise de dados do desemprego em Cabo Verde nos anos de 2006 e 2008, usando informação da base de dados do INE e IEFP. Partindo da análise dos dados em estudo vai-se procurar descrever e perspectivar metodologias que contemplam as variáveis qualitativas e quantitativas com significado social positivo para a sociedade deste país. Após a introdução no capítulo 1, fez-se, no capítulo 2, a análise exploratória dos dados do desemprego em Cabo Verde referente aos anos 2006 e 2008. No capítulo 3 estudam-se associações entre variáveis, usando a metodologia de tabelas contingência, através da realização de testes de independência e testes de homogeneidade, e análise de medidas de associação. As variáveis usadas, vão ser essencialmente, o escalão etário, o género e o ano. O capítulo 4 é dedicado ao estudo de modelos Log - lineares em tabela de contingência, finalizando-se o trabalho com a apresentação das principais conclusões.

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The annual report of the Iowa Board of Nursing includes information on legislation, administrative rules, nursing education, nursing practice, continuing education, licensing, enforcement, administration, financial report, statistics and general nursing demographics.

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The annual report of the Iowa Board of Nursing includes information on legislation, administrative rules, nursing education, nursing practice, continuing education, licensing, enforcement, administration, financial report, statistics and general nursing demographics.

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The annual report of the Iowa Board of Nursing includes information on legislation, administrative rules, nursing education, nursing practice, continuing education, licensing, enforcement, administration, financial report, statistics and general nursing demographics.

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The annual report of the Iowa Board of Nursing includes information on legislation, administrative rules, nursing education, nursing practice, continuing education, licensing, enforcement, administration, financial report, statistics and general nursing demographics.

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Introduction. The DRIVER I project drew up a detailed report of European repositories based on data gathered in a survey in which Spain's participation was very low. This created a highly distorted image of the implementation of repositories in Spain. This study aims to analyse the current state of Spanish open-access institutional repositories and to describe their characteristics. Method. The data were gathered through a Web survey. The questionnaire was based on that used by DRIVER I: coverage; technical infrastructure and technical issues; institutional policies; services created; and stimulators and inhibitors for establishing, filling and maintaining their digital institutional repositories. Analysis. Data were tabulated and analysed systematically according responses obtained from the questionnaire and grouped by coverage. Results. Responses were obtained from 38 of the 104 institutions contacted, which had 29 institutional repositories. This represents 78.3% of the Spanish repositories according to the BuscaRepositorios directory. Spanish repositories contained mainly full-text materials (journal articles and doctoral theses) together with metadata. The software most used was DSpace, followed by EPrints. The metadata standard most used was Dublin Core. Spanish repositories offered more usage statistics and fewer author-oriented services than the European average. The priorities for the future development of the repositories are the need for clear policies on access to scientific production based on public funding and the need for quality control indicators. Conclusions.This is the first detailed study of Spanish institutional repositories. The key stimulants for establishing, filling and maintaining were, in order of importance, the increase of visibility and citation, the interest of decision-makers, simplicity of use and search services. On the other hand the main inhibitors identified were the absence of policies, the lack of integration with other national and international systems and the lack of awareness efforts among academia.

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Two mutually exclusive hypotheses have been put forward to explain the evolution and adaptive function of melanin-based color traits. According to sexual selection theory melanism is a directionally selected signal of individual quality, whereas theory on the maintenance of genetic polymorphism proposes that alternative melanin-based variants achieve equal fitness. Alpine swift (Apus melba) males and females have a conspicuous patch of white feathers on the breast with their rachis varying continuously from white to black, and hence the breast varies from white to striated. If this trait is a sexually selected signal of quality, its expression should be condition dependent and the degree of melanism directionally selected. If variation in melanism is a polymorphism, its expression should be genetically determined and fitness of melanin-based variants equal. We experimentally tested these predictions by exchanging eggs or hatchlings between randomly chosen nests and by estimating survival and reproduction in relation to melanism. We found that breast melanism is heritable and that the environment and body condition do not significantly influence its expression. Between 5 and 50 days of age nestlings were heavier and their wings longer when breast feathers of their biological father were blacker, and they also fledged at a younger age. This shows that aspects of offspring quality covary positively with the degree of melanism. However, this did not result in directional selection because nestling survival and recruitment in the local breeding population were not associated with father breast melanism. Furthermore, adult survival, age at first reproduction and probability of skipping reproduction did not covary with the degree of melanism. Genetic variation in breast melanism is therefore maintained either because nonmelanic males achieve fitness similar to melanic males via a different route than producing fast-growing offspring, or because the advantage of producing fast-growing offspring is not sufficiently pronounced to result in directional selection.

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La regressió basada en distàncies és un mètode de predicció que consisteix en dos passos: a partir de les distàncies entre observacions obtenim les variables latents, les quals passen a ser els regressors en un model lineal de mínims quadrats ordinaris. Les distàncies les calculem a partir dels predictors originals fent us d'una funció de dissimilaritats adequada. Donat que, en general, els regressors estan relacionats de manera no lineal amb la resposta, la seva selecció amb el test F usual no és possible. En aquest treball proposem una solució a aquest problema de selecció de predictors definint tests estadístics generalitzats i adaptant un mètode de bootstrap no paramètric per a l'estimació dels p-valors. Incluim un exemple numèric amb dades de l'assegurança d'automòbils.

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To evaluate primary care physicians' attitude towards implementation of rotavirus (RV) immunisation into the Swiss immunisation schedule, an eight-question internet-based questionnaire was sent to the 3799 subscribers of InfoVac, a nationwide web-based expert network on immunisation issues, which reaches >95% of paediatricians and smaller proportions of other primary care physicians. Five demographic variables were also inquired. Descriptive statistics and multivariate analyses for the main outcome "acceptance of routine RV immunisation" and other variables were performed. Diffusion of innovation theory was used for data assessment. Nine-hundred seventy-seven questionnaires were returned (26%). Fifty percent of participants were paediatricians. Routine RV immunisation was supported by 146 participants (15%; so called early adopters), dismissed by 620 (64%), leaving 211 (21%) undecided. However, when asked whether they would recommend RV vaccination to parents if it were officially recommended by the federal authorities and reimbursed, 467 (48.5%; so called early majority) agreed to recommend RV immunisation. Multivariate analysis revealed that physicians who would immunise their own child (OR: 5.1; 95% CI: 4.1-6.3), hospital-based physicians (OR: 1.6; 95% CI: 1.1-2.3) and physicians from the French (OR: 1.6; 95% CI: 1.2-2.3) and Italian speaking areas of Switzerland (OR: 2.5; 95% CI: 1.1-5.8) were more likely to support RV immunisation. Diffusion of innovation theory predicts a >80% implementation if approximately 50% of a given population support an innovation. Introduction of RV immunisation in Switzerland is likely to be successful, if (i) the federal authorities issue an official recommendation and (ii) costs are covered by basic health care insurance.

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Information underlying analyses of coffee fertilization systems should consider both the soil and the nutritional status of plants. This study investigated the spatial relationship between phosphorus (P) levels in coffee plant tissues and soil chemical and physical properties. The study was performed using two arabica and one canephora coffee variety. Sampling grids were established in the areas, and the points georeferenced. The assessed properties of the soil were levels of available phosphorus (P-Mehlich), remaining phosphorus (P-rem) and particle size, and of the plant tissue, phosphorus levels (foliar P). The data were subjected to descriptive statistical analysis, correlation analysis, cluster analysis, and probability tests. Geostatistical and trend analyses were only performed for pairs of variables with significant linear correlation. The spatial variability for foliar P content was high for the variety Catuai and medium for the other evaluated plants. Unlike P-Mehlich, the variability in P-rem of the soil indicated the nutritional status of this nutrient in the plant.